Harmonization summary
151 label-stable codes
- Label changes detected
- 28
- Multiple dataset contexts
- 0
- Unique codes
- 179
- Enriched codes in this report
- 2
Praxis Data Lab · Variable History
Variable history and harmonization report.
Review variable definitions, cycle chronology, survey design, laboratory methods, method-change boundaries, detection limits, and evidence-backed harmonization actions.
179matching variable codes
598 release records across 12 datasets and 12 cycles.
Search scope
Filtered NHANES variable history
Component: Demographics.
Scientific safeguard
Qualified assessment is authoritative; chronology remains supporting evidence.
Praxis separates source-stated method or instrument changes from automated differences in CDC/NCHS method text. The qualified harmonization assessment below is the researcher-facing conclusion; method chronology explains the underlying evidence and does not override that adjudication.
Variable-by-variable chronology
Qualified harmonization assessment and indexed evidence
Each variable first shows the current qualified assessment used by Study Builder, followed by cycle-specific source evidence and method chronology.
AIALANGCompatible with harmonization
Language of the MEC ACASI Interview Instrument
- Observed years
- 2003–2010
- Release records
- 4
- Datasets
- 4
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010
Praxis harmonization actions
- Apply cycle-specific eligibility rules and restrict the pooled analytic population to a defensible common target population.
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Language of the MEC ACASI Interview Instrument — 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
Cycle-by-cycle release history
- 2003-2004: DEMO_C — Language of the MEC ACASI Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Language of the MEC ACASI Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Language of the MEC ACASI Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Language of the MEC ACASI Interview Instrument — Demographic Variables & Sample Weights (Demographics)
AIALANGACompatible with harmonization
Language of the MEC ACASI Interview Instrument
- Observed years
- 2011–2020
- Release records
- 5
- Datasets
- 5
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Apply cycle-specific eligibility rules and restrict the pooled analytic population to a defensible common target population.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Language of the MEC ACASI Interview Instrument — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Cycle-by-cycle release history
- 2011-2012: DEMO_G — Language of the MEC ACASI Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Language of the MEC ACASI Interview Instrument — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Language of the MEC ACASI Interview Instrument — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Language of the MEC ACASI Interview Instrument — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Language of the MEC ACASI Interview Instrument — Demographic Variables and Sample Weights (Demographics)
DMAETHNEvidence developing
Logical Imputation Flag for Ethnicity
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Logical Imputation Flag for Ethnicity — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Logical Imputation Flag for Ethnicity — Demographic Variables & Sample Weights (Demographics)
DMARACEEvidence developing
Logical Imputation Flag for Race Recode
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Logical Imputation Flag for Race Recode — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Logical Imputation Flag for Race Recode — Demographic Variables & Sample Weights (Demographics)
DMDBORNCompatible with harmonization
In what country {were you/was SP} born?
- Observed years
- 1999–2006
- Release records
- 4
- Datasets
- 4
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- In what country {were you/was SP} born? — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006
Cycle-by-cycle release history
- 1999-2000: DEMO — In what country {were you/was SP} born? — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — In what country {were you/was SP} born? — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — In what country {were you/was SP} born? — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — In what country {were you/was SP} born? — Demographic Variables & Sample Weights (Demographics)
DMDBORN2Compatible with harmonization
In what country {were you/was SP} born?
- Observed years
- 2007–2010
- Release records
- 2
- Datasets
- 2
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2007-2008 → 2009-2010
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- In what country {were you/was SP} born? — 2007-2008 · 2009-2010
Cycle-by-cycle release history
- 2007-2008: DEMO_E — In what country {were you/was SP} born? — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — In what country {were you/was SP} born? — Demographic Variables & Sample Weights (Demographics)
DMDBORN4Compatible with harmonization
In what country {were you/was SP} born?
- Observed years
- 2011–2023
- Release records
- 6
- Datasets
- 6
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020 · 2017-2020 → 2021-2023
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- In what country {were you/was SP} born? — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
- Country of birth — 2021-2023
Cycle-by-cycle release history
- 2011-2012: DEMO_G — In what country {were you/was SP} born? — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — In what country {were you/was SP} born? — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — In what country {were you/was SP} born? — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — In what country {were you/was SP} born? — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — In what country {were you/was SP} born? — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Country of birth — Demographic Variables and Sample Weights (Demographics)
DMDCITZNCompatible with harmonization
{Are you/Is SP} a citizen of the United States? [Information about citizenship is being collected by the U.S. Public Health Service to perform health related research. Providing this information is voluntary and is collected under the authority of the Public Health Service Act. There will be no effect on pending immigration or citizenship petitions.]
- Observed years
- 1999–2018
- Release records
- 10
- Datasets
- 10
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Variable names / labels over time
- {Are you/Is SP} a citizen of the United States? [Information about citizenship is being collected by the U.S. Public Health Service to perform health related research. Providing this information is voluntary and is collected under the authority of the Public Health Service Act. There will be no effect on pending immigration or citizenship petitions.] — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018
Cycle-by-cycle release history
- 1999-2000: DEMO — {Are you/Is SP} a citizen of the United States? [Information about citizenship is being collected by the U.S. Public Health Service to perform health related research. Providing this information is voluntary and is collected under the authority of the Public Health Service Act. There will be no effect on pending immigration or citizenship petitions.] — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — {Are you/Is SP} a citizen of the United States? [Information about citizenship is being collected by the U.S. Public Health Service to perform health related research. Providing this information is voluntary and is collected under the authority of the Public Health Service Act. There will be no effect on pending immigration or citizenship petitions.] — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — {Are you/Is SP} a citizen of the United States? [Information about citizenship is being collected by the U.S. Public Health Service to perform health related research. Providing this information is voluntary and is collected under the authority of the Public Health Service Act. There will be no effect on pending immigration or citizenship petitions.] — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — {Are you/Is SP} a citizen of the United States? [Information about citizenship is being collected by the U.S. Public Health Service to perform health related research. Providing this information is voluntary and is collected under the authority of the Public Health Service Act. There will be no effect on pending immigration or citizenship petitions.] — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — {Are you/Is SP} a citizen of the United States? [Information about citizenship is being collected by the U.S. Public Health Service to perform health related research. Providing this information is voluntary and is collected under the authority of the Public Health Service Act. There will be no effect on pending immigration or citizenship petitions.] — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — {Are you/Is SP} a citizen of the United States? [Information about citizenship is being collected by the U.S. Public Health Service to perform health related research. Providing this information is voluntary and is collected under the authority of the Public Health Service Act. There will be no effect on pending immigration or citizenship petitions.] — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — {Are you/Is SP} a citizen of the United States? [Information about citizenship is being collected by the U.S. Public Health Service to perform health related research. Providing this information is voluntary and is collected under the authority of the Public Health Service Act. There will be no effect on pending immigration or citizenship petitions.] — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — {Are you/Is SP} a citizen of the United States? [Information about citizenship is being collected by the U.S. Public Health Service to perform health related research. Providing this information is voluntary and is collected under the authority of the Public Health Service Act. There will be no effect on pending immigration or citizenship petitions.] — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — {Are you/Is SP} a citizen of the United States? [Information about citizenship is being collected by the U.S. Public Health Service to perform health related research. Providing this information is voluntary and is collected under the authority of the Public Health Service Act. There will be no effect on pending immigration or citizenship petitions.] — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — {Are you/Is SP} a citizen of the United States? [Information about citizenship is being collected by the U.S. Public Health Service to perform health related research. Providing this information is voluntary and is collected under the authority of the Public Health Service Act. There will be no effect on pending immigration or citizenship petitions.] — Demographic Variables and Sample Weights (Demographics)
DMDEDUCCompatible with harmonization
(SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received?
- Observed years
- 1999–2004
- Release records
- 3
- Datasets
- 3
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- (SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — 1999-2000 · 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 1999-2000: DEMO — (SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — (SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — (SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables & Sample Weights (Demographics)
DMDEDUC2Compatible with harmonization
(SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received?
- Observed years
- 1999–2023
- Release records
- 12
- Datasets
- 12
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020 · 2017-2020 → 2021-2023
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Variable names / labels over time
- (SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
- What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 1999-2000: DEMO — (SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — (SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — (SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — (SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — (SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — (SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables and Sample Weights (Demographics)
DMDEDUC3Compatible with harmonization
(SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received?
- Observed years
- 1999–2018
- Release records
- 10
- Datasets
- 10
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Variable names / labels over time
- (SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
- What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018
Cycle-by-cycle release history
- 1999-2000: DEMO — (SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — (SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — (SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — (SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — (SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — (SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? — Demographic Variables and Sample Weights (Demographics)
DMDFMSIZCompatible with harmonization
Total number of people in the Family
- Observed years
- 2005–2018
- Release records
- 7
- Datasets
- 7
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Total number of people in the Family — 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018
Cycle-by-cycle release history
- 2005-2006: DEMO_D — Total number of people in the Family — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Total number of people in the Family — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Total number of people in the Family — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Total number of people in the Family — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Total number of people in the Family — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Total number of people in the Family — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Total number of people in the Family — Demographic Variables and Sample Weights (Demographics)
DMDHHSIZCompatible with harmonization
Total number of people in the Household
- Observed years
- 1999–2023
- Release records
- 11
- Datasets
- 11
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2021-2023
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Variable names / labels over time
- Total number of people in the Household — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2021-2023
Cycle-by-cycle release history
- 1999-2000: DEMO — Total number of people in the Household — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Total number of people in the Household — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Total number of people in the Household — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Total number of people in the Household — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Total number of people in the Household — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Total number of people in the Household — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Total number of people in the Household — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Total number of people in the Household — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Total number of people in the Household — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Total number of people in the Household — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Total number of people in the Household — Demographic Variables and Sample Weights (Demographics)
DMDHHSZACompatible with harmonization
Number of children aged 5 years or younger in the household
- Observed years
- 2011–2018
- Release records
- 4
- Datasets
- 4
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Number of children aged 5 years or younger in the household — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018
Cycle-by-cycle release history
- 2011-2012: DEMO_G — Number of children aged 5 years or younger in the household — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Number of children aged 5 years or younger in the household — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Number of children aged 5 years or younger in the household — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Number of children aged 5 years or younger in the household — Demographic Variables and Sample Weights (Demographics)
DMDHHSZBCompatible with harmonization
Number of children aged 6-17 years old in the household
- Observed years
- 2011–2018
- Release records
- 4
- Datasets
- 4
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Number of children aged 6-17 years old in the household — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018
Cycle-by-cycle release history
- 2011-2012: DEMO_G — Number of children aged 6-17 years old in the household — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Number of children aged 6-17 years old in the household — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Number of children aged 6-17 years old in the household — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Number of children aged 6-17 years old in the household — Demographic Variables and Sample Weights (Demographics)
DMDHHSZECompatible with harmonization
Number of adults aged 60 years or older in the household
- Observed years
- 2011–2018
- Release records
- 4
- Datasets
- 4
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Number of adults aged 60 years or older in the household — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018
Cycle-by-cycle release history
- 2011-2012: DEMO_G — Number of adults aged 60 years or older in the household — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Number of adults aged 60 years or older in the household — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Number of adults aged 60 years or older in the household — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Number of adults aged 60 years or older in the household — Demographic Variables and Sample Weights (Demographics)
DMDHRAGECompatible with harmonization
Age in years of the household reference person at the time of HH screening. Individuals 85 and over are topcoded at 85 years of age.
- Observed years
- 1999–2016
- Release records
- 9
- Datasets
- 9
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Age in years of the household reference person at the time of HH screening. Individuals 85 and over are topcoded at 85 years of age. — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006
- Age in years of the household reference person at the time of HH screening. Individuals 80 and over are topcoded at 80 years of age. — 2007-2008 · 2009-2010
- HH reference person's age in years — 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 1999-2000: DEMO — Age in years of the household reference person at the time of HH screening. Individuals 85 and over are topcoded at 85 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Age in years of the household reference person at the time of HH screening. Individuals 85 and over are topcoded at 85 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Age in years of the household reference person at the time of HH screening. Individuals 85 and over are topcoded at 85 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Age in years of the household reference person at the time of HH screening. Individuals 85 and over are topcoded at 85 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Age in years of the household reference person at the time of HH screening. Individuals 80 and over are topcoded at 80 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Age in years of the household reference person at the time of HH screening. Individuals 80 and over are topcoded at 80 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — HH reference person's age in years — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — HH reference person's age in years — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — HH reference person's age in years — Demographic Variables and Sample Weights (Demographics)
DMDHRAGZCompatible with harmonization
HH reference person's age in years
- Observed years
- 2017–2023
- Release records
- 2
- Datasets
- 2
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2017-2018 → 2021-2023
Praxis harmonization actions
- Confirm that the construct and coding are unchanged before pooling or recoding.
- Apply cycle-specific eligibility rules and restrict the pooled analytic population to a defensible common target population.
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- HH reference person's age in years — 2017-2018
- HH ref person’s age in years — 2021-2023
Cycle-by-cycle release history
- 2017-2018: DEMO_J — HH reference person's age in years — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — HH ref person’s age in years — Demographic Variables and Sample Weights (Demographics)
DMDHRBR2Compatible with harmonization
In what country {were you/was NON-SP Head} born?
- Observed years
- 2007–2010
- Release records
- 2
- Datasets
- 2
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2007-2008 → 2009-2010
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- In what country {were you/was NON-SP Head} born? — 2007-2008 · 2009-2010
Cycle-by-cycle release history
- 2007-2008: DEMO_E — In what country {were you/was NON-SP Head} born? — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — In what country {were you/was NON-SP Head} born? — Demographic Variables & Sample Weights (Demographics)
DMDHRBR4Compatible with harmonization
HH reference person's country of birth
- Observed years
- 2011–2016
- Release records
- 3
- Datasets
- 3
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- HH reference person's country of birth — 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2011-2012: DEMO_G — HH reference person's country of birth — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — HH reference person's country of birth — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — HH reference person's country of birth — Demographic Variables and Sample Weights (Demographics)
DMDHRBRNCompatible with harmonization
In what country {were you/was NON-SP Head} born?
- Observed years
- 1999–2006
- Release records
- 4
- Datasets
- 4
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- In what country {were you/was NON-SP Head} born? — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006
Cycle-by-cycle release history
- 1999-2000: DEMO — In what country {were you/was NON-SP Head} born? — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — In what country {were you/was NON-SP Head} born? — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — In what country {were you/was NON-SP Head} born? — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — In what country {were you/was NON-SP Head} born? — Demographic Variables & Sample Weights (Demographics)
DMDHREDUCompatible with harmonization
What is the highest grade or level of school {you have/NON_SP HEAD has} received?
- Observed years
- 1999–2016
- Release records
- 9
- Datasets
- 9
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Supporting CDC/NCHS evidence
Variable names / labels over time
- What is the highest grade or level of school {you have/NON_SP HEAD has} received? — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
- HH reference person's education level — 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 1999-2000: DEMO — What is the highest grade or level of school {you have/NON_SP HEAD has} received? — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — What is the highest grade or level of school {you have/NON_SP HEAD has} received? — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — What is the highest grade or level of school {you have/NON_SP HEAD has} received? — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — What is the highest grade or level of school {you have/NON_SP HEAD has} received? — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — What is the highest grade or level of school {you have/NON_SP HEAD has} received? — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — What is the highest grade or level of school {you have/NON_SP HEAD has} received? — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — HH reference person's education level — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — HH reference person's education level — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — HH reference person's education level — Demographic Variables and Sample Weights (Demographics)
DMDHREDZCompatible with harmonization
HH reference person's education level
- Observed years
- 2017–2023
- Release records
- 2
- Datasets
- 2
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2017-2018 → 2021-2023
Praxis harmonization actions
- Confirm that the construct and coding are unchanged before pooling or recoding.
- Apply cycle-specific eligibility rules and restrict the pooled analytic population to a defensible common target population.
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- HH reference person's education level — 2017-2018
- HH ref person’s education level — 2021-2023
Cycle-by-cycle release history
- 2017-2018: DEMO_J — HH reference person's education level — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — HH ref person’s education level — Demographic Variables and Sample Weights (Demographics)
DMDHRGNDCompatible with harmonization
Gender of the household reference person
- Observed years
- 1999–2023
- Release records
- 11
- Datasets
- 11
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2021-2023
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
- Apply cycle-specific eligibility rules and restrict the pooled analytic population to a defensible common target population.
Variable names / labels over time
- Gender of the household reference person — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
- HH reference person's gender — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018
- HH ref person’s gender — 2021-2023
Cycle-by-cycle release history
- 1999-2000: DEMO — Gender of the household reference person — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Gender of the household reference person — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Gender of the household reference person — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Gender of the household reference person — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Gender of the household reference person — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Gender of the household reference person — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — HH reference person's gender — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — HH reference person's gender — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — HH reference person's gender — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — HH reference person's gender — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — HH ref person’s gender — Demographic Variables and Sample Weights (Demographics)
DMDHRMARCompatible with harmonization
Marital Status of household reference person
- Observed years
- 1999–2016
- Release records
- 9
- Datasets
- 9
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Marital Status of household reference person — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
- HH reference person's marital status — 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 1999-2000: DEMO — Marital Status of household reference person — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Marital Status of household reference person — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Marital Status of household reference person — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Marital Status of household reference person — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Marital Status of household reference person — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Marital Status of household reference person — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — HH reference person's marital status — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — HH reference person's marital status — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — HH reference person's marital status — Demographic Variables and Sample Weights (Demographics)
DMDHRMAZCompatible with harmonization
HH reference person's marital status
- Observed years
- 2017–2023
- Release records
- 2
- Datasets
- 2
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2017-2018 → 2021-2023
Praxis harmonization actions
- Confirm that the construct and coding are unchanged before pooling or recoding.
- Apply cycle-specific eligibility rules and restrict the pooled analytic population to a defensible common target population.
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- HH reference person's marital status — 2017-2018
- HH ref person’s marital status — 2021-2023
Cycle-by-cycle release history
- 2017-2018: DEMO_J — HH reference person's marital status — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — HH ref person’s marital status — Demographic Variables and Sample Weights (Demographics)
DMDHSEDUCompatible with harmonization
What is the highest grade or level of school {you have/NON-SP SPOUSE has completed or the highest degree {you have/he/she has} received
- Observed years
- 1999–2016
- Release records
- 9
- Datasets
- 9
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Supporting CDC/NCHS evidence
Variable names / labels over time
- What is the highest grade or level of school {you have/NON-SP SPOUSE has completed or the highest degree {you have/he/she has} received — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
- HH reference person's spouse's education level — 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 1999-2000: DEMO — What is the highest grade or level of school {you have/NON-SP SPOUSE has completed or the highest degree {you have/he/she has} received — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — What is the highest grade or level of school {you have/NON-SP SPOUSE has completed or the highest degree {you have/he/she has} received — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — What is the highest grade or level of school {you have/NON-SP SPOUSE has completed or the highest degree {you have/he/she has} received — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — What is the highest grade or level of school {you have/NON-SP SPOUSE has completed or the highest degree {you have/he/she has} received — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — What is the highest grade or level of school {you have/NON-SP SPOUSE has completed or the highest degree {you have/he/she has} received — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — What is the highest grade or level of school {you have/NON-SP SPOUSE has completed or the highest degree {you have/he/she has} received — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — HH reference person's spouse's education level — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — HH reference person's spouse's education level — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — HH reference person's spouse's education level — Demographic Variables and Sample Weights (Demographics)
DMDHSEDZCompatible with harmonization
HH reference person's spouse's education level
- Observed years
- 2017–2023
- Release records
- 2
- Datasets
- 2
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2017-2018 → 2021-2023
Praxis harmonization actions
- Confirm that the construct and coding are unchanged before pooling or recoding.
- Apply cycle-specific eligibility rules and restrict the pooled analytic population to a defensible common target population.
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- HH reference person's spouse's education level — 2017-2018
- HH ref person’s spouse’s education level — 2021-2023
Cycle-by-cycle release history
- 2017-2018: DEMO_J — HH reference person's spouse's education level — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — HH ref person’s spouse’s education level — Demographic Variables and Sample Weights (Demographics)
DMDMARTLCompatible with harmonization
Marital Status
- Observed years
- 1999–2018
- Release records
- 10
- Datasets
- 10
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Apply cycle-specific eligibility rules and restrict the pooled analytic population to a defensible common target population.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Variable names / labels over time
- Marital Status — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
- Marital status — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018
Cycle-by-cycle release history
- 1999-2000: DEMO — Marital Status — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Marital Status — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Marital Status — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Marital Status — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Marital Status — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Marital Status — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Marital status — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Marital status — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Marital status — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Marital status — Demographic Variables and Sample Weights (Demographics)
DMDMARTZCompatible with harmonization
Marital status
- Observed years
- 2017–2023
- Release records
- 2
- Datasets
- 2
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2017-2020 → 2021-2023
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Marital status — 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 2017-2020: P_DEMO — Marital status — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Marital status — Demographic Variables and Sample Weights (Demographics)
DMDSCHOLCompatible with harmonization
{Are you/Is SP} now . . .
- Observed years
- 1999–2010
- Release records
- 6
- Datasets
- 6
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- {Are you/Is SP} now . . . — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
Cycle-by-cycle release history
- 1999-2000: DEMO — {Are you/Is SP} now . . . — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — {Are you/Is SP} now . . . — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — {Are you/Is SP} now . . . — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — {Are you/Is SP} now . . . — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — {Are you/Is SP} now . . . — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — {Are you/Is SP} now . . . — Demographic Variables & Sample Weights (Demographics)
DMDYRSUSCompatible with harmonization
Length of time SP has been in the US.
- Observed years
- 1999–2018
- Release records
- 10
- Datasets
- 10
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Variable names / labels over time
- Length of time SP has been in the US. — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
- Length of time the participant has been in the US. — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018
Cycle-by-cycle release history
- 1999-2000: DEMO — Length of time SP has been in the US. — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Length of time SP has been in the US. — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Length of time SP has been in the US. — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Length of time SP has been in the US. — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Length of time SP has been in the US. — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Length of time SP has been in the US. — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Length of time the participant has been in the US. — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Length of time the participant has been in the US. — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Length of time the participant has been in the US. — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Length of time the participant has been in the US. — Demographic Variables and Sample Weights (Demographics)
DMDYRUSREvidence developing
Length of time the participant has been in the US.
- Observed years
- 2021–2023
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Length of time the participant has been in the US. — 2021-2023
Cycle-by-cycle release history
- 2021-2023: DEMO_L — Length of time the participant has been in the US. — Demographic Variables and Sample Weights (Demographics)
DMDYRUSZEvidence developing
Length of time the participant has been in the US.
- Observed years
- 2017–2020
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Length of time the participant has been in the US. — 2017-2020
Cycle-by-cycle release history
- 2017-2020: P_DEMO — Length of time the participant has been in the US. — Demographic Variables and Sample Weights (Demographics)
DMQADFCCompatible with harmonization
Did {you/SP} ever serve in a foreign country during a time of armed conflict or on a humanitarian or peace-keeping mission? (This would include National Guard or reserve or active duty monitoring or conducting peace keeping operations in Bosnia and Kosovo, in the Sinai between Egypt and Israel, or in response to the 2004 tsunami or Haiti in 2010.)
- Observed years
- 2011–2018
- Release records
- 4
- Datasets
- 4
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Did {you/SP} ever serve in a foreign country during a time of armed conflict or on a humanitarian or peace-keeping mission? (This would include National Guard or reserve or active duty monitoring or conducting peace keeping operations in Bosnia and Kosovo, in the Sinai between Egypt and Israel, or in response to the 2004 tsunami or Haiti in 2010.) — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018
Cycle-by-cycle release history
- 2011-2012: DEMO_G — Did {you/SP} ever serve in a foreign country during a time of armed conflict or on a humanitarian or peace-keeping mission? (This would include National Guard or reserve or active duty monitoring or conducting peace keeping operations in Bosnia and Kosovo, in the Sinai between Egypt and Israel, or in response to the 2004 tsunami or Haiti in 2010.) — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Did {you/SP} ever serve in a foreign country during a time of armed conflict or on a humanitarian or peace-keeping mission? (This would include National Guard or reserve or active duty monitoring or conducting peace keeping operations in Bosnia and Kosovo, in the Sinai between Egypt and Israel, or in response to the 2004 tsunami or Haiti in 2010.) — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Did {you/SP} ever serve in a foreign country during a time of armed conflict or on a humanitarian or peace-keeping mission? (This would include National Guard or reserve or active duty monitoring or conducting peace keeping operations in Bosnia and Kosovo, in the Sinai between Egypt and Israel, or in response to the 2004 tsunami or Haiti in 2010.) — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Did {you/SP} ever serve in a foreign country during a time of armed conflict or on a humanitarian or peace-keeping mission? (This would include National Guard or reserve or active duty monitoring or conducting peace keeping operations in Bosnia and Kosovo, in the Sinai between Egypt and Israel, or in response to the 2004 tsunami or Haiti in 2010.) — Demographic Variables and Sample Weights (Demographics)
DMQMILITCompatible with harmonization
Did {you/SP} ever serve in the Armed Forces of the United States?
- Observed years
- 1999–2010
- Release records
- 6
- Datasets
- 6
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Did {you/SP} ever serve in the Armed Forces of the United States? — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
Cycle-by-cycle release history
- 1999-2000: DEMO — Did {you/SP} ever serve in the Armed Forces of the United States? — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Did {you/SP} ever serve in the Armed Forces of the United States? — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Did {you/SP} ever serve in the Armed Forces of the United States? — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Did {you/SP} ever serve in the Armed Forces of the United States? — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Did {you/SP} ever serve in the Armed Forces of the United States? — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Did {you/SP} ever serve in the Armed Forces of the United States? — Demographic Variables & Sample Weights (Demographics)
DMQMILIZCompatible with harmonization
{Have you/Has SP} ever served on active duty in the U.S. Armed Forces, military Reserves, or National Guard? (Active duty does not include training for the Reserves or National Guard, but does include activation, for service in the U.S. or in a foreign country, in support of military or humanitarian operations.)
- Observed years
- 2011–2023
- Release records
- 5
- Datasets
- 5
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2021-2023
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- {Have you/Has SP} ever served on active duty in the U.S. Armed Forces, military Reserves, or National Guard? (Active duty does not include training for the Reserves or National Guard, but does include activation, for service in the U.S. or in a foreign country, in support of military or humanitarian operations.) — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2021-2023
Cycle-by-cycle release history
- 2011-2012: DEMO_G — {Have you/Has SP} ever served on active duty in the U.S. Armed Forces, military Reserves, or National Guard? (Active duty does not include training for the Reserves or National Guard, but does include activation, for service in the U.S. or in a foreign country, in support of military or humanitarian operations.) — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — {Have you/Has SP} ever served on active duty in the U.S. Armed Forces, military Reserves, or National Guard? (Active duty does not include training for the Reserves or National Guard, but does include activation, for service in the U.S. or in a foreign country, in support of military or humanitarian operations.) — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — {Have you/Has SP} ever served on active duty in the U.S. Armed Forces, military Reserves, or National Guard? (Active duty does not include training for the Reserves or National Guard, but does include activation, for service in the U.S. or in a foreign country, in support of military or humanitarian operations.) — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — {Have you/Has SP} ever served on active duty in the U.S. Armed Forces, military Reserves, or National Guard? (Active duty does not include training for the Reserves or National Guard, but does include activation, for service in the U.S. or in a foreign country, in support of military or humanitarian operations.) — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — {Have you/Has SP} ever served on active duty in the U.S. Armed Forces, military Reserves, or National Guard? (Active duty does not include training for the Reserves or National Guard, but does include activation, for service in the U.S. or in a foreign country, in support of military or humanitarian operations.) — Demographic Variables and Sample Weights (Demographics)
FIAINTRPCompatible with harmonization
Was an interpreter used to conduct the Family interview?
- Observed years
- 2003–2020
- Release records
- 9
- Datasets
- 9
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Was an interpreter used to conduct the Family interview? — 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Cycle-by-cycle release history
- 2003-2004: DEMO_C — Was an interpreter used to conduct the Family interview? — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Was an interpreter used to conduct the Family interview? — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Was an interpreter used to conduct the Family interview? — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Was an interpreter used to conduct the Family interview? — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Was an interpreter used to conduct the Family interview? — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Was an interpreter used to conduct the Family interview? — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Was an interpreter used to conduct the Family interview? — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Was an interpreter used to conduct the Family interview? — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Was an interpreter used to conduct the Family interview? — Demographic Variables and Sample Weights (Demographics)
FIALANGCompatible with harmonization
Language of the Family Interview Instrument
- Observed years
- 2003–2020
- Release records
- 9
- Datasets
- 9
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Language of the Family Interview Instrument — 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Cycle-by-cycle release history
- 2003-2004: DEMO_C — Language of the Family Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Language of the Family Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Language of the Family Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Language of the Family Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Language of the Family Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Language of the Family Interview Instrument — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Language of the Family Interview Instrument — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Language of the Family Interview Instrument — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Language of the Family Interview Instrument — Demographic Variables and Sample Weights (Demographics)
FIAPROXYCompatible with harmonization
Was a Proxy respondent used in conducting the Family Interview?
- Observed years
- 2003–2020
- Release records
- 9
- Datasets
- 9
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Was a Proxy respondent used in conducting the Family Interview? — 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Cycle-by-cycle release history
- 2003-2004: DEMO_C — Was a Proxy respondent used in conducting the Family Interview? — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Was a Proxy respondent used in conducting the Family Interview? — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Was a Proxy respondent used in conducting the Family Interview? — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Was a Proxy respondent used in conducting the Family Interview? — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Was a Proxy respondent used in conducting the Family Interview? — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Was a Proxy respondent used in conducting the Family Interview? — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Was a Proxy respondent used in conducting the Family Interview? — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Was a Proxy respondent used in conducting the Family Interview? — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Was a Proxy respondent used in conducting the Family Interview? — Demographic Variables and Sample Weights (Demographics)
INDFMIN2Compatible with harmonization
Total family income (reported as a range value in dollars)
- Observed years
- 2007–2018
- Release records
- 6
- Datasets
- 6
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Total family income (reported as a range value in dollars) — 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018
Cycle-by-cycle release history
- 2007-2008: DEMO_E — Total family income (reported as a range value in dollars) — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Total family income (reported as a range value in dollars) — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Total family income (reported as a range value in dollars) — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Total family income (reported as a range value in dollars) — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Total family income (reported as a range value in dollars) — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Total family income (reported as a range value in dollars) — Demographic Variables and Sample Weights (Demographics)
INDFMINCCompatible with harmonization
Total family income (reported as a range value in dollars)
- Observed years
- 1999–2006
- Release records
- 4
- Datasets
- 4
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Total family income (reported as a range value in dollars) — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006
Cycle-by-cycle release history
- 1999-2000: DEMO — Total family income (reported as a range value in dollars) — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Total family income (reported as a range value in dollars) — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Total family income (reported as a range value in dollars) — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Total family income (reported as a range value in dollars) — Demographic Variables & Sample Weights (Demographics)
INDFMPIRCompatible with harmonization
Poverty income ratio (PIR) - a ratio of family income to poverty threshold
- Observed years
- 1999–2023
- Release records
- 12
- Datasets
- 12
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020 · 2017-2020 → 2021-2023
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Variable names / labels over time
- Poverty income ratio (PIR) - a ratio of family income to poverty threshold — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006
- A ratio of family income to poverty threshold — 2007-2008 · 2009-2010
- A ratio of family income to poverty guidelines. — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
- Ratio of family income to poverty — 2021-2023
Cycle-by-cycle release history
- 1999-2000: DEMO — Poverty income ratio (PIR) - a ratio of family income to poverty threshold — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Poverty income ratio (PIR) - a ratio of family income to poverty threshold — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Poverty income ratio (PIR) - a ratio of family income to poverty threshold — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Poverty income ratio (PIR) - a ratio of family income to poverty threshold — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — A ratio of family income to poverty threshold — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — A ratio of family income to poverty threshold — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — A ratio of family income to poverty guidelines. — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — A ratio of family income to poverty guidelines. — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — A ratio of family income to poverty guidelines. — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — A ratio of family income to poverty guidelines. — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — A ratio of family income to poverty guidelines. — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Ratio of family income to poverty — Demographic Variables and Sample Weights (Demographics)
INDHHIN2Compatible with harmonization
Total household income (reported as a range value in dollars)
- Observed years
- 2007–2018
- Release records
- 6
- Datasets
- 6
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Total household income (reported as a range value in dollars) — 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018
Cycle-by-cycle release history
- 2007-2008: DEMO_E — Total household income (reported as a range value in dollars) — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Total household income (reported as a range value in dollars) — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Total household income (reported as a range value in dollars) — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Total household income (reported as a range value in dollars) — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Total household income (reported as a range value in dollars) — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Total household income (reported as a range value in dollars) — Demographic Variables and Sample Weights (Demographics)
INDHHINCCompatible with harmonization
Total household income (reported as a range value in dollars)
- Observed years
- 1999–2006
- Release records
- 4
- Datasets
- 4
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Total household income (reported as a range value in dollars) — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006
Cycle-by-cycle release history
- 1999-2000: DEMO — Total household income (reported as a range value in dollars) — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Total household income (reported as a range value in dollars) — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Total household income (reported as a range value in dollars) — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Total household income (reported as a range value in dollars) — Demographic Variables & Sample Weights (Demographics)
MIAINTRPCompatible with harmonization
Was an interpreter used to conduct the MEC CAPI interview?
- Observed years
- 2003–2020
- Release records
- 9
- Datasets
- 9
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020
Praxis harmonization actions
- Apply cycle-specific eligibility rules and restrict the pooled analytic population to a defensible common target population.
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Was an interpreter used to conduct the MEC CAPI interview? — 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Cycle-by-cycle release history
- 2003-2004: DEMO_C — Was an interpreter used to conduct the MEC CAPI interview? — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Was an interpreter used to conduct the MEC CAPI interview? — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Was an interpreter used to conduct the MEC CAPI interview? — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Was an interpreter used to conduct the MEC CAPI interview? — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Was an interpreter used to conduct the MEC CAPI interview? — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Was an interpreter used to conduct the MEC CAPI interview? — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Was an interpreter used to conduct the MEC CAPI interview? — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Was an interpreter used to conduct the MEC CAPI interview? — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Was an interpreter used to conduct the MEC CAPI interview? — Demographic Variables and Sample Weights (Demographics)
MIALANGCompatible with harmonization
Language of the CAPI MEC Interview Instrument
- Observed years
- 2003–2020
- Release records
- 9
- Datasets
- 9
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020
Praxis harmonization actions
- Apply cycle-specific eligibility rules and restrict the pooled analytic population to a defensible common target population.
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Language of the CAPI MEC Interview Instrument — 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
- Language of the MEC CAPI Interview Instrument — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Cycle-by-cycle release history
- 2003-2004: DEMO_C — Language of the CAPI MEC Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Language of the CAPI MEC Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Language of the CAPI MEC Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Language of the CAPI MEC Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Language of the MEC CAPI Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Language of the MEC CAPI Interview Instrument — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Language of the MEC CAPI Interview Instrument — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Language of the MEC CAPI Interview Instrument — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Language of the MEC CAPI Interview Instrument — Demographic Variables and Sample Weights (Demographics)
MIAPROXYCompatible with harmonization
Was a Proxy respondent used in conducting the MEC CAPI Interview?
- Observed years
- 2003–2020
- Release records
- 9
- Datasets
- 9
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020
Praxis harmonization actions
- Apply cycle-specific eligibility rules and restrict the pooled analytic population to a defensible common target population.
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Was a Proxy respondent used in conducting the MEC CAPI Interview? — 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Cycle-by-cycle release history
- 2003-2004: DEMO_C — Was a Proxy respondent used in conducting the MEC CAPI Interview? — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Was a Proxy respondent used in conducting the MEC CAPI Interview? — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Was a Proxy respondent used in conducting the MEC CAPI Interview? — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Was a Proxy respondent used in conducting the MEC CAPI Interview? — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Was a Proxy respondent used in conducting the MEC CAPI Interview? — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Was a Proxy respondent used in conducting the MEC CAPI Interview? — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Was a Proxy respondent used in conducting the MEC CAPI Interview? — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Was a Proxy respondent used in conducting the MEC CAPI Interview? — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Was a Proxy respondent used in conducting the MEC CAPI Interview? — Demographic Variables and Sample Weights (Demographics)
RIAGENDRCompatible
Gender of the sample person
- Observed years
- 1999–2023
- Release records
- 12
- Datasets
- 12
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible · high confidence
CDC/NCHS releases RIAGENDR consistently as the same two-category demographic variable across Continuous NHANES, with code 1 for Male and code 2 for Female. Indexed DEMO-file method, target, and weight changes do not by themselves establish a change in the variable's released coding or longitudinal construct.
Evidence provenance: CDC/NCHS source-confirmed evidence · Praxis deterministic adjudication
Praxis harmonization actions
- Pool the released RIAGENDR categories directly across calibrated cycles. Apply cycle-appropriate NHANES survey weights and design variables separately, and do not reinterpret RIAGENDR as a gender-identity measure beyond the released CDC/NCHS coding.
Supporting CDC/NCHS evidence
Supporting source-evidence notes
CDC/NCHS notes mention these survey or subsample weight variables across the indexed releases: WTINT2YR, WTINT4YR, WTMEC2YR, WTMEC4YR, WTSMSMPA, WTBSMSMA, WTINTPRP, WTMECPRP. Do not apply them together; choose the cycle- and subsample-appropriate weight for the releases included in the analysis. Eligibility/target wording changes across releases; apply cycle-specific eligibility before pooling. A source-supported method/instrument change is flagged below; do not assume direct cross-cycle measurement equivalence.
These notes summarize indexed evidence and method-text signals. They do not supersede the qualified harmonization assessment above.
- Documented weight variables
- WTINT2YR · WTINT4YR · WTMEC2YR · WTMEC4YR · WTSMSMPA · WTBSMSMA · WTINTPRP · WTMECPRP
- Units observed
- Not stated / categorical
- Enriched releases
- 39
- Method-change status
- confirmed method change
Method-change assessment
Confirmed method/instrument change detected
One or more method/instrument change points are supported by captured CDC/NCHS wording. Do not assume raw cross-cycle equivalence; apply documented correction/calibration guidance where available or preserve method periods analytically.
- Releases with method evidence
- 27
- Flagged method boundaries
- 26
- Assessment status
- Confirmed method/instrument change detected
- Inference rule
- Documentation differences ≠ confirmed method changes
Method / instrument change points and harmonization actions
- 2001-2002 → 2001-2002: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source - 2001-2002 → 2001-2002: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source - 2001-2002 → 2005-2006: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source - 2005-2006 → 2005-2006: Source-supported method change · Evidence: CDC/NCHS source wording. The 17 PCDDs/PCDFs, and four cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et al., 1990 and Turner et al., 1994. The method for PCBs is described in Sjodin et al., 2004 and Barr et al., 2003. Refer to the Laboratory Method Files section for a detailed description of the laborator…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source - 2005-2006 → 2005-2006: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source - 2005-2006 → 2005-2006: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source - 2005-2006 → 2007-2008: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source - 2007-2008 → 2007-2008: Source-supported method change · Evidence: CDC/NCHS source wording. The seventeen PCDDs/PCDFs, and four cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et al., 1990 and Turner et al., 1994. The method for PCBs is described in Sjodin et al., 2004 and Barr et al., 2003. Refer to the Laboratory Method Files section for a detailed description of the la…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source - 2007-2008 → 2007-2008: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source - 2007-2008 → 2007-2008: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source - 2007-2008 → 2009-2010: Source-supported method change · Evidence: CDC/NCHS source wording. Serum samples from NHANES 2009-2010 were stored frozen before analysis. Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source - 2009-2010 → 2009-2010: Source-supported method change · Evidence: CDC/NCHS source wording. The seventeen PCDDs/PCDFs, and three cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et al., 1992 and Turner et al., 1994. Reported results met the Division of Laboratory Sciences’ quality control and quality assurance performance criteria for accuracy and precision (similar to spe…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source - 2009-2010 → 2009-2010: Source-supported method change · Evidence: CDC/NCHS source wording. Serum samples from NHANES 2009-2010 were stored frozen before analysis. Twenty nine non-dioxin-like polychlorinated biphenyls were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et …
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source - 2009-2010 → 2009-2010: Source-supported method change · Evidence: CDC/NCHS source wording. Serum samples from NHANES 2009-2010 were stored frozen before analysis. Eight organochlorine pesticides and metabolites were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 20…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source - 2009-2010 → 2011-2012: Source-supported method change · Evidence: CDC/NCHS source wording. Serum samples from NHANES 2011-2012 were stored frozen before analysis. Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source - 2011-2012 → 2011-2012: Source-supported method change · Evidence: CDC/NCHS source wording. The seventeen PCDDs/PCDFs, and three cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et. al., 1992 and Turner et. al., 1994. Reported results met the Division of Laboratory Sciences’ quality control and quality assurance performance criteria for accuracy and precision (similar to s…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source - 2011-2012 → 2011-2012: Source-supported method change · Evidence: CDC/NCHS source wording. Serum samples from NHANES 2011-2012 were stored frozen before analysis. Twenty-nine non-dioxin-like polychlorinated biphenyls were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et …
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source - 2011-2012 → 2011-2012: Source-supported method change · Evidence: CDC/NCHS source wording. Serum samples from NHANES 2011-2012 were stored frozen before analysis. Eight organochlorine pesticides and metabolites were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 20…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source - 2011-2012 → 2013-2014: Source-supported method change · Evidence: CDC/NCHS source wording. Serum samples from NHANES 2013-2014 were stored frozen before analysis. Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum using automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al., 2012…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source - 2013-2014 → 2013-2014: Source-supported method change · Evidence: CDC/NCHS source wording. The seventeen PCDDs/PCDFs, and three cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et. al., 1992 and Turner et. al., 1994. Refer to the Laboratory Method Files for a detailed description of the laboratory methods used. There were no changes to the lab method, lab equipment, or la…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source - 2013-2014 → 2013-2014: Source-supported method change · Evidence: CDC/NCHS source wording. Serum samples from NHANES 2013-2014 were stored frozen before analysis. Twenty-nine non-dioxin-like polychlorinated biphenyls were measured in serum using automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al., 2012, wh…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source - 2013-2014 → 2013-2014: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source - 2013-2014 → 2015-2016: Source-supported method change · Evidence: CDC/NCHS source wording. Serum samples from NHANES 2015-2016 were stored frozen before analysis. Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 (Table 1) were measured in serum using automated liquid-liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source - 2015-2016 → 2015-2016: Source-supported method change · Evidence: CDC/NCHS source wording. The seventeen PCDDs/PCDFs, and three cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et. al., 1992 and Turner et. al., 1994. Refer to the Laboratory Method Files for a detailed description of the laboratory methods used. There were no changes to the lab method, lab equipment, or la…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source - 2015-2016 → 2015-2016: Source-supported method change · Evidence: CDC/NCHS source wording. Serum specimens from NHANES 2015-2016 were stored frozen before analysis. Twenty-four non-dioxin-like polychlorinated biphenyls (Table 1) were measured in serum using automated liquid-liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et a…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source - 2015-2016 → 2015-2016: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source
Cycle-by-cycle method chronology
- 2001-2002: SSBFR_B — Serum samples from NHANES 2001-2002 were stored frozen before analysis. Nine polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum through the use of automated solid phase extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described by Sjodin et al., 2004.
- 2001-2002: SSPCB_B — Twenty nine non-dioxin-like polychlorinated biphenyls were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCBs is described in Sjodin et al., 2004 and Barr et al., 2003. Reported results met the Division of Laboratory Sciences’ quality control and quality assurance performance criteria for accuracy and precision (similar to specifications outlined by Westgard, 1981).
- 2001-2002: SSPST_B — Nine organochlorine pesticides and metabolites were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for organochlorine pesticides is described in Sjodin et al., 2004 and Barr et al., 2003. Reported results met the Division of Laboratory Sciences’ quality control and quality assurance performance criteria for accuracy and precision (similar to specifications outlined by Westgard, 1981).
- 2005-2006: BFRPOL_D — Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes wasperformed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004. Refer to the Laboratory Methods Files section for a detailed descri…
- 2005-2006: DOXPOL_D — The 17 PCDDs/PCDFs, and four cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et al., 1990 and Turner et al., 1994. The method for PCBs is described in Sjodin et al., 2004 and Barr et al., 2003. Refer to the Laboratory Method Files section for a detailed description of the laboratory methods used. There were no changes to the lab method, lab equipment, or lab s…
- 2005-2006: PCBPOL_D — Twenty-nine non-dioxin-like PCBs and eight mono-ortho-substituted PCBs were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004 and Barr et al., 2003. Refer to the Laboratory Methods…
- 2005-2006: PSTPOL_D — Eight organochlorine pesticides and metabolites were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004 and Barr et al., 2003. Refer to the Laboratory Methods Files section for a de…
- 2007-2008: BFRPOL_E — Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004. Refer to the Laboratory Methods Files section for a detailed descr…
- 2007-2008: DOXPOL_E — The seventeen PCDDs/PCDFs, and four cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et al., 1990 and Turner et al., 1994. The method for PCBs is described in Sjodin et al., 2004 and Barr et al., 2003. Refer to the Laboratory Method Files section for a detailed description of the laboratory methods used. There were no changes to the lab method, lab equipment, o…
- 2007-2008: PCBPOL_E — Twenty-nine non-dioxin-like polychlorinated biphenyls were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004 and Barr et al., 2003 Refer to the Laboratory Methods Files section for…
- 2007-2008: PSTPOL_E — Eight organochlorine pesticides and metabolites were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004 and Barr et al., 2003. Refer to the Laboratory Methods Files section for a de…
- 2009-2010: BFRPOL_F — Serum samples from NHANES 2009-2010 were stored frozen before analysis. Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., …
- 2009-2010: DOXPOL_F — The seventeen PCDDs/PCDFs, and three cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et al., 1992 and Turner et al., 1994. Reported results met the Division of Laboratory Sciences’ quality control and quality assurance performance criteria for accuracy and precision (similar to specifications outlined by Westgard, 1981). Refer to the Laboratory Method Files fo…
- 2009-2010: PCBPOL_F — Serum samples from NHANES 2009-2010 were stored frozen before analysis. Twenty nine non-dioxin-like polychlorinated biphenyls were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004…
- 2009-2010: PSTPOL_F — Serum samples from NHANES 2009-2010 were stored frozen before analysis. Eight organochlorine pesticides and metabolites were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004. Refe…
- 2011-2012: BFRPOL_G — Serum samples from NHANES 2011-2012 were stored frozen before analysis. Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., …
- 2011-2012: DOXPOL_G — The seventeen PCDDs/PCDFs, and three cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et. al., 1992 and Turner et. al., 1994. Reported results met the Division of Laboratory Sciences’ quality control and quality assurance performance criteria for accuracy and precision (similar to specifications outlined by Westgard, 1981). Refer to the Laboratory Method Files …
- 2011-2012: PCBPOL_G — Serum samples from NHANES 2011-2012 were stored frozen before analysis. Twenty-nine non-dioxin-like polychlorinated biphenyls were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004…
- 2011-2012: PSTPOL_G — Serum samples from NHANES 2011-2012 were stored frozen before analysis. Eight organochlorine pesticides and metabolites were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004. Refe…
- 2013-2014: BFRPOL_H — Serum samples from NHANES 2013-2014 were stored frozen before analysis. Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum using automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al., 2012, which is a modification of the method described by Sjodin et al., 2004. Refer …
- 2013-2014: DOXPOL_H — The seventeen PCDDs/PCDFs, and three cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et. al., 1992 and Turner et. al., 1994. Refer to the Laboratory Method Files for a detailed description of the laboratory methods used. There were no changes to the lab method, lab equipment, or lab site for this component in the NHANES 2013-2014 cycle.
- 2013-2014: PCBPOL_H — Serum samples from NHANES 2013-2014 were stored frozen before analysis. Twenty-nine non-dioxin-like polychlorinated biphenyls were measured in serum using automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al., 2012, which is a modification of the method described by Sjodin et al., 2004. Refer to t…
- 2013-2014: PSTPOL_H — Serum samples from NHANES 2013-2014 were stored frozen before analysis. Eight organochlorine pesticides and metabolites were measured in serum using automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al., 2012, which is a modification of the method described by Sjodin et al., 2004. Refer to the Lab…
- 2015-2016: BFRPOL_I — Serum samples from NHANES 2015-2016 were stored frozen before analysis. Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 (Table 1) were measured in serum using automated liquid-liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al., 2012, which is a modification of the method described by Sjodin et al., 20…
- 2015-2016: DOXPOL_I — The seventeen PCDDs/PCDFs, and three cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et. al., 1992 and Turner et. al., 1994. Refer to the Laboratory Method Files for a detailed description of the laboratory methods used. There were no changes to the lab method, lab equipment, or lab site for this component in the NHANES 2015-2016 cycle.
- 2015-2016: PCBPOL_I — Serum specimens from NHANES 2015-2016 were stored frozen before analysis. Twenty-four non-dioxin-like polychlorinated biphenyls (Table 1) were measured in serum using automated liquid-liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al., 2012, which is a modification of the method described by Sjodin et al., 2004…
- 2015-2016: PSTPOL_I — Serum samples from NHANES 2015-2016 were stored frozen before analysis. Eight organochlorine pesticides and metabolites (Table 1) were measured in serum using automated liquid-liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al., 2012, which is a modification of the method described by Sjodin et al., 2004. Refer …
Praxis-enriched cycle evidence
- 1999-2000: DEMO · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTINT4YR, WTMEC2YR, WTMEC4YR
- 2001-2002: DEMO_B · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTINT4YR, WTMEC2YR, WTMEC4YR
- 2001-2002: SSBFR_B · Target: Both males and females 3 YEARS - 150 YEARS · Method evidence captured
- 2001-2002: SSPCB_B · Target: Both males and females 3 YEARS - 150 YEARS · Method evidence captured
- 2001-2002: SSPST_B · Target: Both males and females 3 YEARS - 150 YEARS · Method evidence captured
- 2003-2004: DEMO_C · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
- 2005-2006: DEMO_D · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
- 2005-2006: BFRPOL_D · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
- 2005-2006: DOXPOL_D · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
- 2005-2006: PCBPOL_D · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
- 2005-2006: PSTPOL_D · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
- 2007-2008: DEMO_E · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
- 2007-2008: BFRPOL_E · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
- 2007-2008: DOXPOL_E · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
- 2007-2008: PCBPOL_E · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
- 2007-2008: PSTPOL_E · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
- 2009-2010: DEMO_F · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
- 2009-2010: BFRPOL_F · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
- 2009-2010: DOXPOL_F · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
- 2009-2010: PCBPOL_F · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
- 2009-2010: PSTPOL_F · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
- 2011-2012: DEMO_G · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
- 2011-2012: BFRPOL_G · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
- 2011-2012: DOXPOL_G · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
- 2011-2012: PCBPOL_G · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
- 2011-2012: PSTPOL_G · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
- 2013-2014: DEMO_H · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
- 2013-2014: BFRPOL_H · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTBSMSMA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
- 2013-2014: DOXPOL_H · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTBSMSMA · Method evidence captured
- 2013-2014: PCBPOL_H · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTBSMSMA · Method evidence captured
- 2013-2014: PSTPOL_H · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTBSMSMA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
- 2015-2016: DEMO_I · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
- 2015-2016: BFRPOL_I · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTBSMSMA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
- 2015-2016: DOXPOL_I · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTBSMSMA · Method evidence captured
- 2015-2016: PCBPOL_I · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTBSMSMA · Method evidence captured
- 2015-2016: PSTPOL_I · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTBSMSMA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
- 2017-2018: DEMO_J · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
- 2017-2020: P_DEMO · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINTPRP, WTMECPRP
- 2021-2023: DEMO_L · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
Variable names / labels over time
- Gender of the sample person — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
- Gender of the participant. — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 1999-2000: DEMO — Gender of the sample person — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Gender of the sample person — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Gender of the sample person — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Gender of the sample person — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Gender of the sample person — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Gender of the sample person — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Gender of the participant. — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Gender of the participant. — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Gender of the participant. — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Gender of the participant. — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Gender of the participant. — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Gender of the participant. — Demographic Variables and Sample Weights (Demographics)
RIDAGEEXCompatible with harmonization
Best age in months at date of examination for individuals under 85 years of age at screening.
- Observed years
- 1999–2010
- Release records
- 6
- Datasets
- 6
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
- Apply cycle-specific eligibility rules and restrict the pooled analytic population to a defensible common target population.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Best age in months at date of examination for individuals under 85 years of age at screening. — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006
- Best age in months at date of examination for individuals under 80 years of age at screening. — 2007-2008
- Best age in months at date of examination for individuals under 80 years of age at the time of MEC exam. — 2009-2010
Cycle-by-cycle release history
- 1999-2000: DEMO — Best age in months at date of examination for individuals under 85 years of age at screening. — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Best age in months at date of examination for individuals under 85 years of age at screening. — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Best age in months at date of examination for individuals under 85 years of age at screening. — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Best age in months at date of examination for individuals under 85 years of age at screening. — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Best age in months at date of examination for individuals under 80 years of age at screening. — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Best age in months at date of examination for individuals under 80 years of age at the time of MEC exam. — Demographic Variables & Sample Weights (Demographics)
RIDAGEMNCompatible with harmonization
Best age in months at date of screening for individuals under 85 years of age.
- Observed years
- 1999–2023
- Release records
- 12
- Datasets
- 12
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020 · 2017-2020 → 2021-2023
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
- Apply cycle-specific eligibility rules and restrict the pooled analytic population to a defensible common target population.
Variable names / labels over time
- Best age in months at date of screening for individuals under 85 years of age. — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006
- Best age in months at date of screening for individuals under 80 years of age. — 2007-2008 · 2009-2010
- Age in months of the participant at the time of screening. Reported for persons aged 24 months or younger at the time of exam (or screening if not examined). — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 1999-2000: DEMO — Best age in months at date of screening for individuals under 85 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Best age in months at date of screening for individuals under 85 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Best age in months at date of screening for individuals under 85 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Best age in months at date of screening for individuals under 85 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Best age in months at date of screening for individuals under 80 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Best age in months at date of screening for individuals under 80 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Age in months of the participant at the time of screening. Reported for persons aged 24 months or younger at the time of exam (or screening if not examined). — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Age in months of the participant at the time of screening. Reported for persons aged 24 months or younger at the time of exam (or screening if not examined). — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Age in months of the participant at the time of screening. Reported for persons aged 24 months or younger at the time of exam (or screening if not examined). — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Age in months of the participant at the time of screening. Reported for persons aged 24 months or younger at the time of exam (or screening if not examined). — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Age in months of the participant at the time of screening. Reported for persons aged 24 months or younger at the time of exam (or screening if not examined). — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Age in months of the participant at the time of screening. Reported for persons aged 24 months or younger at the time of exam (or screening if not examined). — Demographic Variables and Sample Weights (Demographics)
RIDAGEYRCompatible with harmonization
Best age in years of the sample person at time of HH screening. Individuals 85 and over are topcoded at 85 years of age.
- Observed years
- 1999–2023
- Release records
- 12
- Datasets
- 12
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · high confidence
RIDAGEYR remains age in years at screening, but CDC/NCHS changed the public-use disclosure top-code from 85 years and older through 2005-2006 to 80 years and older beginning in 2007-2008. The construct is continuous, but exact values in the oldest ages are not directly comparable across that disclosure boundary.
Evidence provenance: CDC/NCHS source-confirmed evidence · Praxis deterministic adjudication
Relevant boundaries: 2005-2006 → 2007-2008
Praxis harmonization actions
- For pooled analyses spanning the 2005-2006 to 2007-2008 boundary, harmonize the upper age range to a common 80+ category or restrict continuous-age analyses to participants younger than 80. Do not treat published top-coded values as exact ages.
Supporting CDC/NCHS evidence
Supporting source-evidence notes
CDC/NCHS notes mention these survey or subsample weight variables across the indexed releases: WTINT2YR, WTINT4YR, WTMEC2YR, WTMEC4YR, WTINTPRP, WTMECPRP. Do not apply them together; choose the cycle- and subsample-appropriate weight for the releases included in the analysis. Eligibility/target wording changes across releases; apply cycle-specific eligibility before pooling.
These notes summarize indexed evidence and method-text signals. They do not supersede the qualified harmonization assessment above.
- Documented weight variables
- WTINT2YR · WTINT4YR · WTMEC2YR · WTMEC4YR · WTINTPRP · WTMECPRP
- Units observed
- Not stated / categorical
- Enriched releases
- 13
- Method-change status
- stable method documentation
Method-change assessment
Captured method documentation is stable
Captured method documentation is textually stable across enriched releases. This supports, but does not by itself prove, measurement equivalence across cycles.
- Releases with method evidence
- 1
- Flagged method boundaries
- 0
- Assessment status
- Captured method documentation is stable
- Inference rule
- Documentation differences ≠ confirmed method changes
Cycle-by-cycle method chronology
- 2009-2010: SSIF_F_R — Antibody titers against H3N2v and historical seasonal H3N2 influenza viruses were measured with hemagglutination inhibition (HI) assay at Influenza Division, Centers for Disease Control and Prevention. The selected H3N2v viruses were: A/Indiana/17/2013, A/Indiana/6/2013, and A/Ohio/13/2012. The selected historical H3N2 viruses were: A/Aichi/2/1968, A/Victoria/3/1975, A/Bangkok/1/1979, A/Shanghai/11/1987, A/Beijing/32/1992, A/Wuhan/359/1995, A/Sydney/5/1997, A/Fujian/411/2002, and A/Brisbane/10/…
Praxis-enriched cycle evidence
- 1999-2000: DEMO · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTINT4YR, WTMEC2YR, WTMEC4YR
- 2001-2002: DEMO_B · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTINT4YR, WTMEC2YR, WTMEC4YR
- 2003-2004: DEMO_C · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
- 2005-2006: DEMO_D · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
- 2007-2008: DEMO_E · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
- 2009-2010: DEMO_F · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
- 2009-2010: SSIF_F_R · Target: Both males and females 6 YEARS - 150 YEARS · Method evidence captured
- 2011-2012: DEMO_G · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
- 2013-2014: DEMO_H · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
- 2015-2016: DEMO_I · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
- 2017-2018: DEMO_J · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
- 2017-2020: P_DEMO · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINTPRP, WTMECPRP
- 2021-2023: DEMO_L · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
Variable names / labels over time
- Best age in years of the sample person at time of HH screening. Individuals 85 and over are topcoded at 85 years of age. — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006
- Best age in years of the sample person at time of HH screening. Individuals 80 and over are topcoded at 80 years of age. — 2007-2008 · 2009-2010
- Age in years of the participant at the time of screening. Individuals 80 and over are topcoded at 80 years of age. — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
- Age in years of the participant at the time of screening. Individuals 80 and over are top-coded at 80 years of age. — 2021-2023
Cycle-by-cycle release history
- 1999-2000: DEMO — Best age in years of the sample person at time of HH screening. Individuals 85 and over are topcoded at 85 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Best age in years of the sample person at time of HH screening. Individuals 85 and over are topcoded at 85 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Best age in years of the sample person at time of HH screening. Individuals 85 and over are topcoded at 85 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Best age in years of the sample person at time of HH screening. Individuals 85 and over are topcoded at 85 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Best age in years of the sample person at time of HH screening. Individuals 80 and over are topcoded at 80 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Best age in years of the sample person at time of HH screening. Individuals 80 and over are topcoded at 80 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Age in years of the participant at the time of screening. Individuals 80 and over are topcoded at 80 years of age. — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Age in years of the participant at the time of screening. Individuals 80 and over are topcoded at 80 years of age. — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Age in years of the participant at the time of screening. Individuals 80 and over are topcoded at 80 years of age. — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Age in years of the participant at the time of screening. Individuals 80 and over are topcoded at 80 years of age. — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Age in years of the participant at the time of screening. Individuals 80 and over are topcoded at 80 years of age. — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Age in years of the participant at the time of screening. Individuals 80 and over are top-coded at 80 years of age. — Demographic Variables and Sample Weights (Demographics)
RIDEXAGMCompatible with harmonization
Age in months of the participant at the time of examination. Reported for persons aged 19 years or younger at the time of examination.
- Observed years
- 2011–2023
- Release records
- 5
- Datasets
- 5
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2021-2023
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Age in months of the participant at the time of examination. Reported for persons aged 19 years or younger at the time of examination. — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2021-2023
Cycle-by-cycle release history
- 2011-2012: DEMO_G — Age in months of the participant at the time of examination. Reported for persons aged 19 years or younger at the time of examination. — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Age in months of the participant at the time of examination. Reported for persons aged 19 years or younger at the time of examination. — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Age in months of the participant at the time of examination. Reported for persons aged 19 years or younger at the time of examination. — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Age in months of the participant at the time of examination. Reported for persons aged 19 years or younger at the time of examination. — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Age in months of the participant at the time of examination. Reported for persons aged 19 years or younger at the time of examination. — Demographic Variables and Sample Weights (Demographics)
RIDEXAGYEvidence developing
Age in years of the participant at the time of examination. Reported for persons aged 2-19 years at the time of screening.
- Observed years
- 2011–2012
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Age in years of the participant at the time of examination. Reported for persons aged 2-19 years at the time of screening. — 2011-2012
Cycle-by-cycle release history
- 2011-2012: DEMO_G — Age in years of the participant at the time of examination. Reported for persons aged 2-19 years at the time of screening. — Demographic Variables & Sample Weights (Demographics)
RIDEXMONCompatible with harmonization
Six month time period when the examination was performed - two categories: November 1 through April 30, May 1 through October 31.
- Observed years
- 1999–2023
- Release records
- 12
- Datasets
- 12
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020 · 2017-2020 → 2021-2023
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Variable names / labels over time
- Six month time period when the examination was performed - two categories: November 1 through April 30, May 1 through October 31. — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 1999-2000: DEMO — Six month time period when the examination was performed - two categories: November 1 through April 30, May 1 through October 31. — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Six month time period when the examination was performed - two categories: November 1 through April 30, May 1 through October 31. — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Six month time period when the examination was performed - two categories: November 1 through April 30, May 1 through October 31. — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Six month time period when the examination was performed - two categories: November 1 through April 30, May 1 through October 31. — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Six month time period when the examination was performed - two categories: November 1 through April 30, May 1 through October 31. — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Six month time period when the examination was performed - two categories: November 1 through April 30, May 1 through October 31. — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Six month time period when the examination was performed - two categories: November 1 through April 30, May 1 through October 31. — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Six month time period when the examination was performed - two categories: November 1 through April 30, May 1 through October 31. — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Six month time period when the examination was performed - two categories: November 1 through April 30, May 1 through October 31. — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Six month time period when the examination was performed - two categories: November 1 through April 30, May 1 through October 31. — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Six month time period when the examination was performed - two categories: November 1 through April 30, May 1 through October 31. — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Six month time period when the examination was performed - two categories: November 1 through April 30, May 1 through October 31. — Demographic Variables and Sample Weights (Demographics)
RIDEXPRGCompatible with harmonization
Pregnancy status at the time of MEC exam.
- Observed years
- 1999–2023
- Release records
- 12
- Datasets
- 12
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020 · 2017-2020 → 2021-2023
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Apply cycle-specific eligibility rules and restrict the pooled analytic population to a defensible common target population.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Variable names / labels over time
- Pregnancy status at the time of MEC exam. — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006
- Pregnancy status for females between 20 and 44 years of age at the time of MEC exam. — 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 1999-2000: DEMO — Pregnancy status at the time of MEC exam. — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Pregnancy status at the time of MEC exam. — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Pregnancy status at the time of MEC exam. — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Pregnancy status at the time of MEC exam. — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Pregnancy status for females between 20 and 44 years of age at the time of MEC exam. — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Pregnancy status for females between 20 and 44 years of age at the time of MEC exam. — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Pregnancy status for females between 20 and 44 years of age at the time of MEC exam. — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Pregnancy status for females between 20 and 44 years of age at the time of MEC exam. — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Pregnancy status for females between 20 and 44 years of age at the time of MEC exam. — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Pregnancy status for females between 20 and 44 years of age at the time of MEC exam. — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Pregnancy status for females between 20 and 44 years of age at the time of MEC exam. — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Pregnancy status for females between 20 and 44 years of age at the time of MEC exam. — Demographic Variables and Sample Weights (Demographics)
RIDPREGCompatible with harmonization
Pregnancy status variable based on all source data. NOTE: This is the previous pregnancy status recode variable. RIDPREG is a more conservative pregnancy status variable. Please review the file documentation.
- Observed years
- 1999–2002
- Release records
- 2
- Datasets
- 2
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Pregnancy status variable based on all source data. NOTE: This is the previous pregnancy status recode variable. RIDPREG is a more conservative pregnancy status variable. Please review the file documentation. — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: DEMO — Pregnancy status variable based on all source data. NOTE: This is the previous pregnancy status recode variable. RIDPREG is a more conservative pregnancy status variable. Please review the file documentation. — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Pregnancy status variable based on all source data. NOTE: This is the previous pregnancy status recode variable. RIDPREG is a more conservative pregnancy status variable. Please review the file documentation. — Demographic Variables & Sample Weights (Demographics)
RIDRETH1Compatible
Recode of reported race and ethnicity information.
- Observed years
- 1999–2023
- Release records
- 12
- Datasets
- 12
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible · high confidence
RIDRETH1 is retained as the longitudinal five-category race/Hispanic-origin recode, including after the expanded RIDRETH3 variable was introduced in 2011-2012. CDC/NCHS specifically retained RIDRETH1 to support comparison with earlier Continuous NHANES cycles.
Evidence provenance: CDC/NCHS source-confirmed evidence · Praxis deterministic adjudication
Praxis harmonization actions
- Use RIDRETH1 when a common five-category race/Hispanic-origin construct is required across earlier and later cycles. Apply survey-design requirements separately and do not substitute RIDRETH3 categories without an explicit recode.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Recode of reported race and ethnicity information. — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
- Recode of reported race and Hispanic origin information — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 1999-2000: DEMO — Recode of reported race and ethnicity information. — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Recode of reported race and ethnicity information. — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Recode of reported race and ethnicity information. — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Recode of reported race and ethnicity information. — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Recode of reported race and ethnicity information. — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Recode of reported race and ethnicity information. — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Recode of reported race and Hispanic origin information — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Recode of reported race and Hispanic origin information — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Recode of reported race and Hispanic origin information — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Recode of reported race and Hispanic origin information — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Recode of reported race and Hispanic origin information — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Recode of reported race and Hispanic origin information — Demographic Variables and Sample Weights (Demographics)
RIDRETH2Compatible with harmonization
Linked NH3 Race and Ethnicity Recode.
- Observed years
- 1999–2004
- Release records
- 3
- Datasets
- 3
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Linked NH3 Race and Ethnicity Recode. — 1999-2000 · 2001-2002 · 2003-2004
Cycle-by-cycle release history
- 1999-2000: DEMO — Linked NH3 Race and Ethnicity Recode. — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Linked NH3 Race and Ethnicity Recode. — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Linked NH3 Race and Ethnicity Recode. — Demographic Variables & Sample Weights (Demographics)
RIDRETH3Compatible
Recode of reported race and Hispanic origin information, with Non-Hispanic Asian Category
- Observed years
- 2011–2023
- Release records
- 6
- Datasets
- 6
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible · high confidence
RIDRETH3 was introduced in 2011-2012 as an expanded race/Hispanic-origin recode that distinguishes Non-Hispanic Asian participants following the revised NHANES sampling design. It is a stable construct within its released era, but it is not simply a renamed RIDRETH1.
Evidence provenance: CDC/NCHS source-confirmed evidence · Praxis deterministic adjudication
Praxis harmonization actions
- Pool RIDRETH3 within 2011-2012 and later calibrated cycles when the expanded categories are analytically appropriate. Treat RIDRETH1 and RIDRETH3 as parallel construct variants; use an explicit common recode when combining analyses across their differing category schemes.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Recode of reported race and Hispanic origin information, with Non-Hispanic Asian Category — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 2011-2012: DEMO_G — Recode of reported race and Hispanic origin information, with Non-Hispanic Asian Category — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Recode of reported race and Hispanic origin information, with Non-Hispanic Asian Category — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Recode of reported race and Hispanic origin information, with Non-Hispanic Asian Category — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Recode of reported race and Hispanic origin information, with Non-Hispanic Asian Category — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Recode of reported race and Hispanic origin information, with Non-Hispanic Asian Category — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Recode of reported race and Hispanic origin information, with Non-Hispanic Asian Category — Demographic Variables and Sample Weights (Demographics)
RIDSTATRCompatible with harmonization
Interview and Examination Status of the Sample Person.
- Observed years
- 1999–2023
- Release records
- 12
- Datasets
- 12
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020 · 2017-2020 → 2021-2023
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Variable names / labels over time
- Interview and Examination Status of the Sample Person. — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
- Interview and examination status of the participant. — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview and Examination Status of the Sample Person. — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Interview and Examination Status of the Sample Person. — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Interview and Examination Status of the Sample Person. — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Interview and Examination Status of the Sample Person. — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Interview and Examination Status of the Sample Person. — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Interview and Examination Status of the Sample Person. — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Interview and examination status of the participant. — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Interview and examination status of the participant. — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Interview and examination status of the participant. — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Interview and examination status of the participant. — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Interview and examination status of the participant. — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Interview and examination status of the participant. — Demographic Variables and Sample Weights (Demographics)
SDDSRVYRCompatible with harmonization
Data Release Number.
- Observed years
- 1999–2023
- Release records
- 12
- Datasets
- 12
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020 · 2017-2020 → 2021-2023
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Variable names / labels over time
- Data Release Number. — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
- Data release cycle — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 1999-2000: DEMO — Data Release Number. — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Data Release Number. — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Data Release Number. — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Data Release Number. — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Data Release Number. — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Data Release Number. — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Data release cycle — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Data release cycle — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Data release cycle — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Data release cycle — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Data release cycle — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Data release cycle — Demographic Variables and Sample Weights (Demographics)
SDJ1REPNEvidence developing
Jack Knife Replicate Number
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Jack Knife Replicate Number — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Jack Knife Replicate Number — Demographic Variables & Sample Weights (Demographics)
SDMVPSUCompatible with harmonization
Masked Variance Unit Pseudo-PSU variable for variance estimation
- Observed years
- 1999–2023
- Release records
- 12
- Datasets
- 12
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020 · 2017-2020 → 2021-2023
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Variable names / labels over time
- Masked Variance Unit Pseudo-PSU variable for variance estimation — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
- Masked variance unit pseudo-PSU variable for variance estimation — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 1999-2000: DEMO — Masked Variance Unit Pseudo-PSU variable for variance estimation — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Masked Variance Unit Pseudo-PSU variable for variance estimation — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Masked Variance Unit Pseudo-PSU variable for variance estimation — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Masked Variance Unit Pseudo-PSU variable for variance estimation — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Masked Variance Unit Pseudo-PSU variable for variance estimation — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Masked Variance Unit Pseudo-PSU variable for variance estimation — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Masked variance unit pseudo-PSU variable for variance estimation — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Masked variance unit pseudo-PSU variable for variance estimation — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Masked variance unit pseudo-PSU variable for variance estimation — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Masked variance unit pseudo-PSU variable for variance estimation — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Masked variance unit pseudo-PSU variable for variance estimation — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Masked variance unit pseudo-PSU variable for variance estimation — Demographic Variables and Sample Weights (Demographics)
SDMVSTRACompatible with harmonization
Masked Variance Unit Pseudo-Stratum variable for variance estimation
- Observed years
- 1999–2023
- Release records
- 12
- Datasets
- 12
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020 · 2017-2020 → 2021-2023
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Variable names / labels over time
- Masked Variance Unit Pseudo-Stratum variable for variance estimation — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
- Masked variance unit pseudo-stratum variable for variance estimation — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 1999-2000: DEMO — Masked Variance Unit Pseudo-Stratum variable for variance estimation — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Masked Variance Unit Pseudo-Stratum variable for variance estimation — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Masked Variance Unit Pseudo-Stratum variable for variance estimation — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Masked Variance Unit Pseudo-Stratum variable for variance estimation — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Masked Variance Unit Pseudo-Stratum variable for variance estimation — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Masked Variance Unit Pseudo-Stratum variable for variance estimation — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Masked variance unit pseudo-stratum variable for variance estimation — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Masked variance unit pseudo-stratum variable for variance estimation — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Masked variance unit pseudo-stratum variable for variance estimation — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Masked variance unit pseudo-stratum variable for variance estimation — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Masked variance unit pseudo-stratum variable for variance estimation — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Masked variance unit pseudo-stratum variable for variance estimation — Demographic Variables and Sample Weights (Demographics)
SEQNAdjustment required
Respondent sequence number.
- Observed years
- 1999–2023
- Release records
- 12
- Datasets
- 12
- Components
- Demographics
Qualified Praxis harmonization assessment
Adjustment required · high confidence
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020 · 2017-2020 → 2021-2023
Praxis harmonization actions
- Apply cycle-specific eligibility rules and restrict the pooled analytic population to a defensible common target population.
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Supporting CDC/NCHS evidence
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Variable names / labels over time
- Respondent sequence number. — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 1999-2000: DEMO — Respondent sequence number. — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Respondent sequence number. — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Respondent sequence number. — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Respondent sequence number. — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Respondent sequence number. — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Respondent sequence number. — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Respondent sequence number. — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Respondent sequence number. — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Respondent sequence number. — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Respondent sequence number. — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Respondent sequence number. — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Respondent sequence number. — Demographic Variables and Sample Weights (Demographics)
SIAINTRPCompatible with harmonization
Was an interpreter used to conduct the Sample Person (SP) interview?
- Observed years
- 2003–2020
- Release records
- 9
- Datasets
- 9
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Was an interpreter used to conduct the Sample Person (SP) interview? — 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Cycle-by-cycle release history
- 2003-2004: DEMO_C — Was an interpreter used to conduct the Sample Person (SP) interview? — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Was an interpreter used to conduct the Sample Person (SP) interview? — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Was an interpreter used to conduct the Sample Person (SP) interview? — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Was an interpreter used to conduct the Sample Person (SP) interview? — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Was an interpreter used to conduct the Sample Person (SP) interview? — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Was an interpreter used to conduct the Sample Person (SP) interview? — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Was an interpreter used to conduct the Sample Person (SP) interview? — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Was an interpreter used to conduct the Sample Person (SP) interview? — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Was an interpreter used to conduct the Sample Person (SP) interview? — Demographic Variables and Sample Weights (Demographics)
SIALANGCompatible with harmonization
Language of the Sample Person Interview Instrument
- Observed years
- 2003–2020
- Release records
- 9
- Datasets
- 9
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Language of the Sample Person Interview Instrument — 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Cycle-by-cycle release history
- 2003-2004: DEMO_C — Language of the Sample Person Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Language of the Sample Person Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Language of the Sample Person Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Language of the Sample Person Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Language of the Sample Person Interview Instrument — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Language of the Sample Person Interview Instrument — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Language of the Sample Person Interview Instrument — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Language of the Sample Person Interview Instrument — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Language of the Sample Person Interview Instrument — Demographic Variables and Sample Weights (Demographics)
SIAPROXYCompatible with harmonization
Was a Proxy respondent used in conducting the Sample Person (SP) interview?
- Observed years
- 2003–2020
- Release records
- 9
- Datasets
- 9
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2017-2020
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Was a Proxy respondent used in conducting the Sample Person (SP) interview? — 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Cycle-by-cycle release history
- 2003-2004: DEMO_C — Was a Proxy respondent used in conducting the Sample Person (SP) interview? — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Was a Proxy respondent used in conducting the Sample Person (SP) interview? — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Was a Proxy respondent used in conducting the Sample Person (SP) interview? — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Was a Proxy respondent used in conducting the Sample Person (SP) interview? — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Was a Proxy respondent used in conducting the Sample Person (SP) interview? — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Was a Proxy respondent used in conducting the Sample Person (SP) interview? — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Was a Proxy respondent used in conducting the Sample Person (SP) interview? — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Was a Proxy respondent used in conducting the Sample Person (SP) interview? — Demographic Variables and Sample Weights (Demographics)
- 2017-2020: P_DEMO — Was a Proxy respondent used in conducting the Sample Person (SP) interview? — Demographic Variables and Sample Weights (Demographics)
WTINT2YRCompatible with harmonization
Interviewed Sample Persons.
- Observed years
- 1999–2023
- Release records
- 11
- Datasets
- 11
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2021-2023
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Variable names / labels over time
- Interviewed Sample Persons. — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
- Interviewed participants. — 2011-2012
- Full sample 2 year interview weight. — 2013-2014 · 2015-2016 · 2017-2018 · 2021-2023
Cycle-by-cycle release history
- 1999-2000: DEMO — Interviewed Sample Persons. — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Interviewed Sample Persons. — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Interviewed Sample Persons. — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Interviewed Sample Persons. — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Interviewed Sample Persons. — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Interviewed Sample Persons. — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Interviewed participants. — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Full sample 2 year interview weight. — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Full sample 2 year interview weight. — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Full sample 2 year interview weight. — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Full sample 2 year interview weight. — Demographic Variables and Sample Weights (Demographics)
WTINT4YRCompatible with harmonization
Interviewed Sample Persons. Used for 1999-2002 data collection years only.
- Observed years
- 1999–2002
- Release records
- 2
- Datasets
- 2
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Interviewed Sample Persons. Used for 1999-2002 data collection years only. — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: DEMO — Interviewed Sample Persons. Used for 1999-2002 data collection years only. — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Interviewed Sample Persons. Used for 1999-2002 data collection years only. — Demographic Variables & Sample Weights (Demographics)
WTINTPRPEvidence developing
Full sample interview weight
- Observed years
- 2017–2020
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Full sample interview weight — 2017-2020
Cycle-by-cycle release history
- 2017-2020: P_DEMO — Full sample interview weight — Demographic Variables and Sample Weights (Demographics)
WTIREP01Evidence developing
Interview Weight Jack Knife Replicate 01
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 01 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 01 — Demographic Variables & Sample Weights (Demographics)
WTIREP02Evidence developing
Interview Weight Jack Knife Replicate 02
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 02 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 02 — Demographic Variables & Sample Weights (Demographics)
WTIREP03Evidence developing
Interview Weight Jack Knife Replicate 03
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 03 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 03 — Demographic Variables & Sample Weights (Demographics)
WTIREP04Evidence developing
Interview Weight Jack Knife Replicate 04
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 04 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 04 — Demographic Variables & Sample Weights (Demographics)
WTIREP05Evidence developing
Interview Weight Jack Knife Replicate 05
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 05 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 05 — Demographic Variables & Sample Weights (Demographics)
WTIREP06Evidence developing
Interview Weight Jack Knife Replicate 06
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 06 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 06 — Demographic Variables & Sample Weights (Demographics)
WTIREP07Evidence developing
Interview Weight Jack Knife Replicate 07
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 07 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 07 — Demographic Variables & Sample Weights (Demographics)
WTIREP08Evidence developing
Interview Weight Jack Knife Replicate 08
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 08 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 08 — Demographic Variables & Sample Weights (Demographics)
WTIREP09Evidence developing
Interview Weight Jack Knife Replicate 09
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 09 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 09 — Demographic Variables & Sample Weights (Demographics)
WTIREP10Evidence developing
Interview Weight Jack Knife Replicate 10
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 10 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 10 — Demographic Variables & Sample Weights (Demographics)
WTIREP11Evidence developing
Interview Weight Jack Knife Replicate 11
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 11 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 11 — Demographic Variables & Sample Weights (Demographics)
WTIREP12Evidence developing
Interview Weight Jack Knife Replicate 12
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 12 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 12 — Demographic Variables & Sample Weights (Demographics)
WTIREP13Evidence developing
Interview Weight Jack Knife Replicate 13
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 13 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 13 — Demographic Variables & Sample Weights (Demographics)
WTIREP14Evidence developing
Interview Weight Jack Knife Replicate 14
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 14 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 14 — Demographic Variables & Sample Weights (Demographics)
WTIREP15Evidence developing
Interview Weight Jack Knife Replicate 15
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 15 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 15 — Demographic Variables & Sample Weights (Demographics)
WTIREP16Evidence developing
Interview Weight Jack Knife Replicate 16
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 16 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 16 — Demographic Variables & Sample Weights (Demographics)
WTIREP17Evidence developing
Interview Weight Jack Knife Replicate 17
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 17 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 17 — Demographic Variables & Sample Weights (Demographics)
WTIREP18Evidence developing
Interview Weight Jack Knife Replicate 18
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 18 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 18 — Demographic Variables & Sample Weights (Demographics)
WTIREP19Evidence developing
Interview Weight Jack Knife Replicate 19
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 19 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 19 — Demographic Variables & Sample Weights (Demographics)
WTIREP20Evidence developing
Interview Weight Jack Knife Replicate 20
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 20 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 20 — Demographic Variables & Sample Weights (Demographics)
WTIREP21Evidence developing
Interview Weight Jack Knife Replicate 21
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 21 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 21 — Demographic Variables & Sample Weights (Demographics)
WTIREP22Evidence developing
Interview Weight Jack Knife Replicate 22
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 22 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 22 — Demographic Variables & Sample Weights (Demographics)
WTIREP23Evidence developing
Interview Weight Jack Knife Replicate 23
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 23 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 23 — Demographic Variables & Sample Weights (Demographics)
WTIREP24Evidence developing
Interview Weight Jack Knife Replicate 24
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 24 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 24 — Demographic Variables & Sample Weights (Demographics)
WTIREP25Evidence developing
Interview Weight Jack Knife Replicate 25
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 25 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 25 — Demographic Variables & Sample Weights (Demographics)
WTIREP26Evidence developing
Interview Weight Jack Knife Replicate 26
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 26 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 26 — Demographic Variables & Sample Weights (Demographics)
WTIREP27Evidence developing
Interview Weight Jack Knife Replicate 27
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 27 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 27 — Demographic Variables & Sample Weights (Demographics)
WTIREP28Evidence developing
Interview Weight Jack Knife Replicate 28
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 28 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 28 — Demographic Variables & Sample Weights (Demographics)
WTIREP29Evidence developing
Interview Weight Jack Knife Replicate 29
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 29 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 29 — Demographic Variables & Sample Weights (Demographics)
WTIREP30Evidence developing
Interview Weight Jack Knife Replicate 30
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 30 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 30 — Demographic Variables & Sample Weights (Demographics)
WTIREP31Evidence developing
Interview Weight Jack Knife Replicate 31
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 31 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 31 — Demographic Variables & Sample Weights (Demographics)
WTIREP32Evidence developing
Interview Weight Jack Knife Replicate 32
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 32 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 32 — Demographic Variables & Sample Weights (Demographics)
WTIREP33Evidence developing
Interview Weight Jack Knife Replicate 33
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 33 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 33 — Demographic Variables & Sample Weights (Demographics)
WTIREP34Evidence developing
Interview Weight Jack Knife Replicate 34
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 34 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 34 — Demographic Variables & Sample Weights (Demographics)
WTIREP35Evidence developing
Interview Weight Jack Knife Replicate 35
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 35 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 35 — Demographic Variables & Sample Weights (Demographics)
WTIREP36Evidence developing
Interview Weight Jack Knife Replicate 36
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 36 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 36 — Demographic Variables & Sample Weights (Demographics)
WTIREP37Evidence developing
Interview Weight Jack Knife Replicate 37
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 37 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 37 — Demographic Variables & Sample Weights (Demographics)
WTIREP38Evidence developing
Interview Weight Jack Knife Replicate 38
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 38 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 38 — Demographic Variables & Sample Weights (Demographics)
WTIREP39Evidence developing
Interview Weight Jack Knife Replicate 39
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 39 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 39 — Demographic Variables & Sample Weights (Demographics)
WTIREP40Evidence developing
Interview Weight Jack Knife Replicate 40
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 40 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 40 — Demographic Variables & Sample Weights (Demographics)
WTIREP41Evidence developing
Interview Weight Jack Knife Replicate 41
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 41 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 41 — Demographic Variables & Sample Weights (Demographics)
WTIREP42Evidence developing
Interview Weight Jack Knife Replicate 42
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 42 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 42 — Demographic Variables & Sample Weights (Demographics)
WTIREP43Evidence developing
Interview Weight Jack Knife Replicate 43
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 43 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 43 — Demographic Variables & Sample Weights (Demographics)
WTIREP44Evidence developing
Interview Weight Jack Knife Replicate 44
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 44 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 44 — Demographic Variables & Sample Weights (Demographics)
WTIREP45Evidence developing
Interview Weight Jack Knife Replicate 45
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 45 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 45 — Demographic Variables & Sample Weights (Demographics)
WTIREP46Evidence developing
Interview Weight Jack Knife Replicate 46
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 46 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 46 — Demographic Variables & Sample Weights (Demographics)
WTIREP47Evidence developing
Interview Weight Jack Knife Replicate 47
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 47 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 47 — Demographic Variables & Sample Weights (Demographics)
WTIREP48Evidence developing
Interview Weight Jack Knife Replicate 48
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 48 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 48 — Demographic Variables & Sample Weights (Demographics)
WTIREP49Evidence developing
Interview Weight Jack Knife Replicate 49
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 49 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 49 — Demographic Variables & Sample Weights (Demographics)
WTIREP50Evidence developing
Interview Weight Jack Knife Replicate 50
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 50 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 50 — Demographic Variables & Sample Weights (Demographics)
WTIREP51Evidence developing
Interview Weight Jack Knife Replicate 51
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 51 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 51 — Demographic Variables & Sample Weights (Demographics)
WTIREP52Evidence developing
Interview Weight Jack Knife Replicate 52
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Interview Weight Jack Knife Replicate 52 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — Interview Weight Jack Knife Replicate 52 — Demographic Variables & Sample Weights (Demographics)
WTMEC2YRCompatible with harmonization
Both Interviewed and MEC Examined Sample Persons.
- Observed years
- 1999–2023
- Release records
- 11
- Datasets
- 11
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004 · 2003-2004 → 2005-2006 · 2005-2006 → 2007-2008 · 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2021-2023
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Confirm that the construct and coding are unchanged before pooling or recoding.
Variable names / labels over time
- Both Interviewed and MEC Examined Sample Persons. — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
- Both interviewed and MEC examined participants. — 2011-2012
- Full sample 2 year MEC exam weight. — 2013-2014 · 2015-2016 · 2017-2018 · 2021-2023
Cycle-by-cycle release history
- 1999-2000: DEMO — Both Interviewed and MEC Examined Sample Persons. — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Both Interviewed and MEC Examined Sample Persons. — Demographic Variables & Sample Weights (Demographics)
- 2003-2004: DEMO_C — Both Interviewed and MEC Examined Sample Persons. — Demographic Variables & Sample Weights (Demographics)
- 2005-2006: DEMO_D — Both Interviewed and MEC Examined Sample Persons. — Demographic Variables & Sample Weights (Demographics)
- 2007-2008: DEMO_E — Both Interviewed and MEC Examined Sample Persons. — Demographic Variables & Sample Weights (Demographics)
- 2009-2010: DEMO_F — Both Interviewed and MEC Examined Sample Persons. — Demographic Variables & Sample Weights (Demographics)
- 2011-2012: DEMO_G — Both interviewed and MEC examined participants. — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Full sample 2 year MEC exam weight. — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Full sample 2 year MEC exam weight. — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Full sample 2 year MEC exam weight. — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Full sample 2 year MEC exam weight. — Demographic Variables and Sample Weights (Demographics)
WTMEC4YRCompatible with harmonization
Both Interviewed and MEC Examined Sample Persons. Used for 1999-2002 data collection years only.
- Observed years
- 1999–2002
- Release records
- 2
- Datasets
- 2
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 1999-2000 → 2001-2002
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Both Interviewed and MEC Examined Sample Persons. Used for 1999-2002 data collection years only. — 1999-2000 · 2001-2002
Cycle-by-cycle release history
- 1999-2000: DEMO — Both Interviewed and MEC Examined Sample Persons. Used for 1999-2002 data collection years only. — Demographic Variables & Sample Weights (Demographics)
- 2001-2002: DEMO_B — Both Interviewed and MEC Examined Sample Persons. Used for 1999-2002 data collection years only. — Demographic Variables & Sample Weights (Demographics)
WTMECPRPEvidence developing
Full sample MEC exam weight
- Observed years
- 2017–2020
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- Full sample MEC exam weight — 2017-2020
Cycle-by-cycle release history
- 2017-2020: P_DEMO — Full sample MEC exam weight — Demographic Variables and Sample Weights (Demographics)
WTMREP01Evidence developing
MEC Exam Weight Jack Knife Replicate 01
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 01 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 01 — Demographic Variables & Sample Weights (Demographics)
WTMREP02Evidence developing
MEC Exam Weight Jack Knife Replicate 02
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 02 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 02 — Demographic Variables & Sample Weights (Demographics)
WTMREP03Evidence developing
MEC Exam Weight Jack Knife Replicate 03
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 03 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 03 — Demographic Variables & Sample Weights (Demographics)
WTMREP04Evidence developing
MEC Exam Weight Jack Knife Replicate 04
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 04 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 04 — Demographic Variables & Sample Weights (Demographics)
WTMREP05Evidence developing
MEC Exam Weight Jack Knife Replicate 05
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 05 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 05 — Demographic Variables & Sample Weights (Demographics)
WTMREP06Evidence developing
MEC Exam Weight Jack Knife Replicate 06
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 06 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 06 — Demographic Variables & Sample Weights (Demographics)
WTMREP07Evidence developing
MEC Exam Weight Jack Knife Replicate 07
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 07 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 07 — Demographic Variables & Sample Weights (Demographics)
WTMREP08Evidence developing
MEC Exam Weight Jack Knife Replicate 08
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 08 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 08 — Demographic Variables & Sample Weights (Demographics)
WTMREP09Evidence developing
MEC Exam Weight Jack Knife Replicate 09
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 09 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 09 — Demographic Variables & Sample Weights (Demographics)
WTMREP10Evidence developing
MEC Exam Weight Jack Knife Replicate 10
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 10 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 10 — Demographic Variables & Sample Weights (Demographics)
WTMREP11Evidence developing
MEC Exam Weight Jack Knife Replicate 11
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 11 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 11 — Demographic Variables & Sample Weights (Demographics)
WTMREP12Evidence developing
MEC Exam Weight Jack Knife Replicate 12
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 12 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 12 — Demographic Variables & Sample Weights (Demographics)
WTMREP13Evidence developing
MEC Exam Weight Jack Knife Replicate 13
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 13 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 13 — Demographic Variables & Sample Weights (Demographics)
WTMREP14Evidence developing
MEC Exam Weight Jack Knife Replicate 14
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 14 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 14 — Demographic Variables & Sample Weights (Demographics)
WTMREP15Evidence developing
MEC Exam Weight Jack Knife Replicate 15
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 15 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 15 — Demographic Variables & Sample Weights (Demographics)
WTMREP16Evidence developing
MEC Exam Weight Jack Knife Replicate 16
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 16 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 16 — Demographic Variables & Sample Weights (Demographics)
WTMREP17Evidence developing
MEC Exam Weight Jack Knife Replicate 17
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 17 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 17 — Demographic Variables & Sample Weights (Demographics)
WTMREP18Evidence developing
MEC Exam Weight Jack Knife Replicate 18
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 18 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 18 — Demographic Variables & Sample Weights (Demographics)
WTMREP19Evidence developing
MEC Exam Weight Jack Knife Replicate 19
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 19 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 19 — Demographic Variables & Sample Weights (Demographics)
WTMREP20Evidence developing
MEC Exam Weight Jack Knife Replicate 20
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 20 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 20 — Demographic Variables & Sample Weights (Demographics)
WTMREP21Evidence developing
MEC Exam Weight Jack Knife Replicate 21
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 21 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 21 — Demographic Variables & Sample Weights (Demographics)
WTMREP22Evidence developing
MEC Exam Weight Jack Knife Replicate 22
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 22 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 22 — Demographic Variables & Sample Weights (Demographics)
WTMREP23Evidence developing
MEC Exam Weight Jack Knife Replicate 23
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 23 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 23 — Demographic Variables & Sample Weights (Demographics)
WTMREP24Evidence developing
MEC Exam Weight Jack Knife Replicate 24
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 24 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 24 — Demographic Variables & Sample Weights (Demographics)
WTMREP25Evidence developing
MEC Exam Weight Jack Knife Replicate 25
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 25 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 25 — Demographic Variables & Sample Weights (Demographics)
WTMREP26Evidence developing
MEC Exam Weight Jack Knife Replicate 26
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 26 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 26 — Demographic Variables & Sample Weights (Demographics)
WTMREP27Evidence developing
MEC Exam Weight Jack Knife Replicate 27
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 27 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 27 — Demographic Variables & Sample Weights (Demographics)
WTMREP28Evidence developing
MEC Exam Weight Jack Knife Replicate 28
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 28 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 28 — Demographic Variables & Sample Weights (Demographics)
WTMREP29Evidence developing
MEC Exam Weight Jack Knife Replicate 29
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 29 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 29 — Demographic Variables & Sample Weights (Demographics)
WTMREP30Evidence developing
MEC Exam Weight Jack Knife Replicate 30
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 30 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 30 — Demographic Variables & Sample Weights (Demographics)
WTMREP31Evidence developing
MEC Exam Weight Jack Knife Replicate 31
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 31 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 31 — Demographic Variables & Sample Weights (Demographics)
WTMREP32Evidence developing
MEC Exam Weight Jack Knife Replicate 32
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 32 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 32 — Demographic Variables & Sample Weights (Demographics)
WTMREP33Evidence developing
MEC Exam Weight Jack Knife Replicate 33
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 33 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 33 — Demographic Variables & Sample Weights (Demographics)
WTMREP34Evidence developing
MEC Exam Weight Jack Knife Replicate 34
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 34 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 34 — Demographic Variables & Sample Weights (Demographics)
WTMREP35Evidence developing
MEC Exam Weight Jack Knife Replicate 35
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 35 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 35 — Demographic Variables & Sample Weights (Demographics)
WTMREP36Evidence developing
MEC Exam Weight Jack Knife Replicate 36
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 36 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 36 — Demographic Variables & Sample Weights (Demographics)
WTMREP37Evidence developing
MEC Exam Weight Jack Knife Replicate 37
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 37 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 37 — Demographic Variables & Sample Weights (Demographics)
WTMREP38Evidence developing
MEC Exam Weight Jack Knife Replicate 38
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 38 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 38 — Demographic Variables & Sample Weights (Demographics)
WTMREP39Evidence developing
MEC Exam Weight Jack Knife Replicate 39
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 39 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 39 — Demographic Variables & Sample Weights (Demographics)
WTMREP40Evidence developing
MEC Exam Weight Jack Knife Replicate 40
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 40 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 40 — Demographic Variables & Sample Weights (Demographics)
WTMREP41Evidence developing
MEC Exam Weight Jack Knife Replicate 41
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 41 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 41 — Demographic Variables & Sample Weights (Demographics)
WTMREP42Evidence developing
MEC Exam Weight Jack Knife Replicate 42
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 42 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 42 — Demographic Variables & Sample Weights (Demographics)
WTMREP43Evidence developing
MEC Exam Weight Jack Knife Replicate 43
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 43 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 43 — Demographic Variables & Sample Weights (Demographics)
WTMREP44Evidence developing
MEC Exam Weight Jack Knife Replicate 44
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 44 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 44 — Demographic Variables & Sample Weights (Demographics)
WTMREP45Evidence developing
MEC Exam Weight Jack Knife Replicate 45
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 45 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 45 — Demographic Variables & Sample Weights (Demographics)
WTMREP46Evidence developing
MEC Exam Weight Jack Knife Replicate 46
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 46 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 46 — Demographic Variables & Sample Weights (Demographics)
WTMREP47Evidence developing
MEC Exam Weight Jack Knife Replicate 47
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 47 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 47 — Demographic Variables & Sample Weights (Demographics)
WTMREP48Evidence developing
MEC Exam Weight Jack Knife Replicate 48
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 48 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 48 — Demographic Variables & Sample Weights (Demographics)
WTMREP49Evidence developing
MEC Exam Weight Jack Knife Replicate 49
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 49 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 49 — Demographic Variables & Sample Weights (Demographics)
WTMREP50Evidence developing
MEC Exam Weight Jack Knife Replicate 50
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 50 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 50 — Demographic Variables & Sample Weights (Demographics)
WTMREP51Evidence developing
MEC Exam Weight Jack Knife Replicate 51
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 51 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 51 — Demographic Variables & Sample Weights (Demographics)
WTMREP52Evidence developing
MEC Exam Weight Jack Knife Replicate 52
- Observed years
- 1999–2000
- Release records
- 1
- Datasets
- 1
- Components
- Demographics
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- MEC Exam Weight Jack Knife Replicate 52 — 1999-2000
Cycle-by-cycle release history
- 1999-2000: DEMO — MEC Exam Weight Jack Knife Replicate 52 — Demographic Variables & Sample Weights (Demographics)