Harmonization summary
80 label-stable codes
- Label changes detected
- 7
- Multiple dataset contexts
- 0
- Unique codes
- 87
- Enriched codes in this report
- 0
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.
87matching variable codes
840 release records across 10 datasets and 10 cycles.
Search scope
Results for “DR1IFF”
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.
DR1_020Compatible with harmonization
What time did you begin to eat/drink the meal/food?
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- What time did you begin to eat/drink the meal/food? — 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
- 2003-2004: DR1IFF_C — What time did you begin to eat/drink the meal/food? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — What time did you begin to eat/drink the meal/food? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — What time did you begin to eat/drink the meal/food? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — What time did you begin to eat/drink the meal/food? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — What time did you begin to eat/drink the meal/food? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — What time did you begin to eat/drink the meal/food? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — What time did you begin to eat/drink the meal/food? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — What time did you begin to eat/drink the meal/food? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — What time did you begin to eat/drink the meal/food? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — What time did you begin to eat/drink the meal/food? — Dietary Interview - Individual Foods, First Day (Dietary)
DR1_030ZCompatible with harmonization
Name of eating occasion
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Name of eating occasion — 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
- 2003-2004: DR1IFF_C — Name of eating occasion — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Name of eating occasion — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Name of eating occasion — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Name of eating occasion — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Name of eating occasion — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Name of eating occasion — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Name of eating occasion — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Name of eating occasion — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Name of eating occasion — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Name of eating occasion — Dietary Interview - Individual Foods, First Day (Dietary)
DR1_040ZCompatible with harmonization
Was this food eaten at home?
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- Confirm that the construct and coding are unchanged before pooling or recoding.
- 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.
Variable names / labels over time
- Was this food eaten at home? — 2003-2004
- Did you eat this meal at home? — 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 2003-2004: DR1IFF_C — Was this food eaten at home? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Did you eat this meal at home? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Did you eat this meal at home? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Did you eat this meal at home? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Did you eat this meal at home? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Did you eat this meal at home? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Did you eat this meal at home? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Did you eat this meal at home? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Did you eat this meal at home? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Did you eat this meal at home? — Dietary Interview - Individual Foods, First Day (Dietary)
DR1CCMNMCompatible with harmonization
Combination food number
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Combination food number — 2003-2004
- Combination food number (sequential number) — 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 2003-2004: DR1IFF_C — Combination food number — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Combination food number (sequential number) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Combination food number (sequential number) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Combination food number (sequential number) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Combination food number (sequential number) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Combination food number (sequential number) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Combination food number (sequential number) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Combination food number (sequential number) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Combination food number (sequential number) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Combination food number (sequential number) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1CCMTXCompatible with harmonization
Combination food type
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Combination food type — 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
- 2003-2004: DR1IFF_C — Combination food type — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Combination food type — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Combination food type — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Combination food type — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Combination food type — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Combination food type — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Combination food type — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Combination food type — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Combination food type — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Combination food type — Dietary Interview - Individual Foods, First Day (Dietary)
DR1DAYCompatible with harmonization
Intake day of the week
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- Confirm that the construct and coding are unchanged before pooling or recoding.
- 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.
Supporting CDC/NCHS evidence
- Source evidence 1
- Source evidence 2
- Source evidence 3
- Source evidence 4
- Source evidence 5
- Source evidence 6
- Source evidence 7
- Source evidence 8
- Source evidence 9
- Source evidence 10
- Source evidence 11
- Source evidence 12
- Source evidence 13
- Source evidence 14
- Source evidence 15
- Source evidence 16
- Source evidence 17
- Source evidence 18
- Source evidence 19
- Source evidence 20
- Source evidence 21
- Source evidence 22
- Source evidence 23
- Source evidence 24
- Source evidence 25
- Source evidence 26
- Source evidence 27
- Source evidence 28
- Source evidence 29
- Source evidence 30
Variable names / labels over time
- Intake day of the week — 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
- 2003-2004: DR1IFF_C — Intake day of the week — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Intake day of the week — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Intake day of the week — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Intake day of the week — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Intake day of the week — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Intake day of the week — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Intake day of the week — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Intake day of the week — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Intake day of the week — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Intake day of the week — Dietary Interview - Individual Foods, First Day (Dietary)
DR1DBIHCompatible with harmonization
Number of days between intake day and the day of family questionnaire administered in the household.
- Observed years
- 2007–2023
- Release records
- 8
- Datasets
- 8
- Components
- Dietary
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 · 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.
- 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.
Supporting CDC/NCHS evidence
- Source evidence 1
- Source evidence 2
- Source evidence 3
- Source evidence 4
- Source evidence 5
- Source evidence 6
- Source evidence 7
- Source evidence 8
- Source evidence 9
- Source evidence 10
- Source evidence 11
- Source evidence 12
- Source evidence 13
- Source evidence 14
- Source evidence 15
- Source evidence 16
- Source evidence 17
- Source evidence 18
- Source evidence 19
- Source evidence 20
- Source evidence 21
- Source evidence 22
- Source evidence 23
- Source evidence 24
Variable names / labels over time
- Number of days between intake day and the day of family questionnaire administered in the household. — 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 2007-2008: DR1IFF_E — Number of days between intake day and the day of family questionnaire administered in the household. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Number of days between intake day and the day of family questionnaire administered in the household. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Number of days between intake day and the day of family questionnaire administered in the household. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Number of days between intake day and the day of family questionnaire administered in the household. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Number of days between intake day and the day of family questionnaire administered in the household. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Number of days between intake day and the day of family questionnaire administered in the household. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Number of days between intake day and the day of family questionnaire administered in the household. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Number of days between intake day and the day of family questionnaire administered in the household. — Dietary Interview - Individual Foods, First Day (Dietary)
DR1DRSTZCompatible with harmonization
Dietary recall status
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Supporting CDC/NCHS evidence
- Source evidence 1
- Source evidence 2
- Source evidence 3
- Source evidence 4
- Source evidence 5
- Source evidence 6
- Source evidence 7
- Source evidence 8
- Source evidence 9
- Source evidence 10
- Source evidence 11
- Source evidence 12
- Source evidence 13
- Source evidence 14
- Source evidence 15
- Source evidence 16
- Source evidence 17
- Source evidence 18
- Source evidence 19
- Source evidence 20
- Source evidence 21
- Source evidence 22
- Source evidence 23
- Source evidence 24
- Source evidence 25
- Source evidence 26
- Source evidence 27
- Source evidence 28
- Source evidence 29
- Source evidence 30
Variable names / labels over time
- Dietary recall status — 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
- 2003-2004: DR1IFF_C — Dietary recall status — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Dietary recall status — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Dietary recall status — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Dietary recall status — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Dietary recall status — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Dietary recall status — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Dietary recall status — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Dietary recall status — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Dietary recall status — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Dietary recall status — Dietary Interview - Individual Foods, First Day (Dietary)
DR1EXMERCompatible with harmonization
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Supporting CDC/NCHS evidence
- Source evidence 1
- Source evidence 2
- Source evidence 3
- Source evidence 4
- Source evidence 5
- Source evidence 6
- Source evidence 7
- Source evidence 8
- Source evidence 9
- Source evidence 10
- Source evidence 11
- Source evidence 12
- Source evidence 13
- Source evidence 14
- Source evidence 15
- Source evidence 16
- Source evidence 17
- Source evidence 18
- Source evidence 19
- Source evidence 20
- Source evidence 21
- Source evidence 22
- Source evidence 23
- Source evidence 24
- Source evidence 25
- Source evidence 26
- Source evidence 27
- Source evidence 28
- Source evidence 29
- Source evidence 30
Variable names / labels over time
- — 2003-2004
- Interviewer ID code — 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 2003-2004: DR1IFF_C — — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Interviewer ID code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Interviewer ID code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Interviewer ID code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Interviewer ID code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Interviewer ID code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Interviewer ID code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Interviewer ID code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Interviewer ID code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Interviewer ID code — Dietary Interview - Individual Foods, First Day (Dietary)
DR1FSCompatible with harmonization
Where did you get (this/most of the ingredients for this) {FOODNAME}?
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Where did you get (this/most of the ingredients for this) {FOODNAME}? — 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
- 2003-2004: DR1IFF_C — Where did you get (this/most of the ingredients for this) {FOODNAME}? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Where did you get (this/most of the ingredients for this) {FOODNAME}? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Where did you get (this/most of the ingredients for this) {FOODNAME}? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Where did you get (this/most of the ingredients for this) {FOODNAME}? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Where did you get (this/most of the ingredients for this) {FOODNAME}? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Where did you get (this/most of the ingredients for this) {FOODNAME}? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Where did you get (this/most of the ingredients for this) {FOODNAME}? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Where did you get (this/most of the ingredients for this) {FOODNAME}? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Where did you get (this/most of the ingredients for this) {FOODNAME}? — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Where did you get (this/most of the ingredients for this) {FOODNAME}? — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IACARCompatible with harmonization
Alpha-carotene (mcg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Alpha-carotene (mcg) — 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
- 2003-2004: DR1IFF_C — Alpha-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Alpha-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Alpha-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Alpha-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Alpha-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Alpha-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Alpha-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Alpha-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Alpha-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Alpha-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IALCOCompatible with harmonization
Alcohol (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Alcohol (gm) — 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
- 2003-2004: DR1IFF_C — Alcohol (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Alcohol (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Alcohol (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Alcohol (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Alcohol (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Alcohol (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Alcohol (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Alcohol (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Alcohol (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Alcohol (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IATOACompatible with harmonization
Added alpha-tocopherol (Vitamin E) (mg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Added alpha-tocopherol (Vitamin E) (mg) — 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
- 2003-2004: DR1IFF_C — Added alpha-tocopherol (Vitamin E) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Added alpha-tocopherol (Vitamin E) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Added alpha-tocopherol (Vitamin E) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Added alpha-tocopherol (Vitamin E) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Added alpha-tocopherol (Vitamin E) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Added alpha-tocopherol (Vitamin E) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Added alpha-tocopherol (Vitamin E) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Added alpha-tocopherol (Vitamin E) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Added alpha-tocopherol (Vitamin E) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Added alpha-tocopherol (Vitamin E) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IATOCCompatible with harmonization
Vitamin E as alpha-tocopherol (mg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Vitamin E as alpha-tocopherol (mg) — 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
- 2003-2004: DR1IFF_C — Vitamin E as alpha-tocopherol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Vitamin E as alpha-tocopherol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Vitamin E as alpha-tocopherol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Vitamin E as alpha-tocopherol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Vitamin E as alpha-tocopherol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Vitamin E as alpha-tocopherol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Vitamin E as alpha-tocopherol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Vitamin E as alpha-tocopherol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Vitamin E as alpha-tocopherol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Vitamin E as alpha-tocopherol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IB12ACompatible with harmonization
Added vitamin B12 (mcg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Added vitamin B12 (mcg) — 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
- 2003-2004: DR1IFF_C — Added vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Added vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Added vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Added vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Added vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Added vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Added vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Added vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Added vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Added vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IBCARCompatible with harmonization
Beta-carotene (mcg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Beta-carotene (mcg) — 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
- 2003-2004: DR1IFF_C — Beta-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Beta-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Beta-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Beta-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Beta-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Beta-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Beta-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Beta-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Beta-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Beta-carotene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1ICAFFCompatible with harmonization
Caffeine (mg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Caffeine (mg) — 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
- 2003-2004: DR1IFF_C — Caffeine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Caffeine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Caffeine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Caffeine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Caffeine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Caffeine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Caffeine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Caffeine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Caffeine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Caffeine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1ICALCCompatible with harmonization
Calcium (mg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Calcium (mg) — 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
- 2003-2004: DR1IFF_C — Calcium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Calcium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Calcium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Calcium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Calcium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Calcium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Calcium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Calcium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Calcium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Calcium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1ICARBCompatible with harmonization
Carbohydrate (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Carbohydrate (gm) — 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
- 2003-2004: DR1IFF_C — Carbohydrate (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Carbohydrate (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Carbohydrate (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Carbohydrate (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Carbohydrate (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Carbohydrate (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Carbohydrate (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Carbohydrate (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Carbohydrate (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Carbohydrate (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1ICHLCompatible with harmonization
Total choline (mg)
- Observed years
- 2005–2023
- Release records
- 9
- Datasets
- 9
- Components
- Dietary
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 · 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.
- 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.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Total choline (mg) — 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 2005-2006: DR1IFF_D — Total choline (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Total choline (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Total choline (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Total choline (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Total choline (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Total choline (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Total choline (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Total choline (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Total choline (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1ICHOLCompatible with harmonization
Cholesterol (mg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Cholesterol (mg) — 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
- 2003-2004: DR1IFF_C — Cholesterol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Cholesterol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Cholesterol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Cholesterol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Cholesterol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Cholesterol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Cholesterol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Cholesterol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Cholesterol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Cholesterol (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1ICOPPCompatible with harmonization
Copper (mg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Copper (mg) — 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
- 2003-2004: DR1IFF_C — Copper (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Copper (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Copper (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Copper (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Copper (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Copper (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Copper (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Copper (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Copper (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Copper (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1ICRYPCompatible with harmonization
Beta-cryptoxanthin (mcg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Beta-cryptoxanthin (mcg) — 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
- 2003-2004: DR1IFF_C — Beta-cryptoxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Beta-cryptoxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Beta-cryptoxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Beta-cryptoxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Beta-cryptoxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Beta-cryptoxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Beta-cryptoxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Beta-cryptoxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Beta-cryptoxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Beta-cryptoxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IFACompatible with harmonization
Folic acid (mcg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Folic acid (mcg) — 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
- 2003-2004: DR1IFF_C — Folic acid (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Folic acid (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Folic acid (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Folic acid (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Folic acid (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Folic acid (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Folic acid (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Folic acid (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Folic acid (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Folic acid (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IFDCDCompatible with harmonization
USDA food code
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- USDA food code — 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
- 2003-2004: DR1IFF_C — USDA food code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — USDA food code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — USDA food code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — USDA food code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — USDA food code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — USDA food code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — USDA food code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — USDA food code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — USDA food code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — USDA food code — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IFDFECompatible with harmonization
Folate as dietary folate equivalents (mcg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Folate as dietary folate equivalents (mcg) — 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
- 2003-2004: DR1IFF_C — Folate as dietary folate equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Folate as dietary folate equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Folate as dietary folate equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Folate as dietary folate equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Folate as dietary folate equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Folate as dietary folate equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Folate as dietary folate equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Folate as dietary folate equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Folate as dietary folate equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Folate as dietary folate equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IFFCompatible with harmonization
Food folate (mcg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Food folate (mcg) — 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
- 2003-2004: DR1IFF_C — Food folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Food folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Food folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Food folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Food folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Food folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Food folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Food folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Food folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Food folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IFIBECompatible with harmonization
Dietary fiber (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Dietary fiber (gm) — 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
- 2003-2004: DR1IFF_C — Dietary fiber (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Dietary fiber (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Dietary fiber (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Dietary fiber (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Dietary fiber (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Dietary fiber (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Dietary fiber (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Dietary fiber (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Dietary fiber (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Dietary fiber (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IFOLACompatible with harmonization
Total Folate (mcg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- Confirm that the construct and coding are unchanged before pooling or recoding.
- 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.
Variable names / labels over time
- Total Folate (mcg) — 2003-2004
- Total folate (mcg) — 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 2003-2004: DR1IFF_C — Total Folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Total folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Total folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Total folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Total folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Total folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Total folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Total folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Total folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Total folate (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IGRMSCompatible with harmonization
Gram weight of the food/individual component
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Gram weight of the food/individual component — 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
- 2003-2004: DR1IFF_C — Gram weight of the food/individual component — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Gram weight of the food/individual component — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Gram weight of the food/individual component — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Gram weight of the food/individual component — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Gram weight of the food/individual component — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Gram weight of the food/individual component — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Gram weight of the food/individual component — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Gram weight of the food/individual component — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Gram weight of the food/individual component — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Gram weight of the food/individual component — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IIRONCompatible with harmonization
Iron (mg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Iron (mg) — 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
- 2003-2004: DR1IFF_C — Iron (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Iron (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Iron (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Iron (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Iron (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Iron (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Iron (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Iron (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Iron (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Iron (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IKCALCompatible with harmonization
Energy (kcal)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Energy (kcal) — 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
- 2003-2004: DR1IFF_C — Energy (kcal) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Energy (kcal) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Energy (kcal) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Energy (kcal) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Energy (kcal) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Energy (kcal) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Energy (kcal) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Energy (kcal) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Energy (kcal) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Energy (kcal) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1ILINECompatible with harmonization
Food/individual component number
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- Confirm that the construct and coding are unchanged before pooling or recoding.
- 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.
Variable names / labels over time
- Food/individual component number — 2003-2004
- Food/Individual component number — 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 2003-2004: DR1IFF_C — Food/individual component number — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Food/Individual component number — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Food/Individual component number — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Food/Individual component number — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Food/Individual component number — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Food/Individual component number — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Food/Individual component number — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Food/Individual component number — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Food/Individual component number — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Food/Individual component number — Dietary Interview - Individual Foods, First Day (Dietary)
DR1ILYCOCompatible with harmonization
Lycopene (mcg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Lycopene (mcg) — 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
- 2003-2004: DR1IFF_C — Lycopene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Lycopene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Lycopene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Lycopene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Lycopene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Lycopene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Lycopene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Lycopene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Lycopene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Lycopene (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1ILZCompatible with harmonization
Lutein + zeaxanthin (mcg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Lutein + zeaxanthin (mcg) — 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
- 2003-2004: DR1IFF_C — Lutein + zeaxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Lutein + zeaxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Lutein + zeaxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Lutein + zeaxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Lutein + zeaxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Lutein + zeaxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Lutein + zeaxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Lutein + zeaxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Lutein + zeaxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Lutein + zeaxanthin (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IM161Compatible with harmonization
MFA 16:1 (Hexadecenoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- MFA 16:1 (Hexadecenoic) (gm) — 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
- 2003-2004: DR1IFF_C — MFA 16:1 (Hexadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — MFA 16:1 (Hexadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — MFA 16:1 (Hexadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — MFA 16:1 (Hexadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — MFA 16:1 (Hexadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — MFA 16:1 (Hexadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — MFA 16:1 (Hexadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — MFA 16:1 (Hexadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — MFA 16:1 (Hexadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — MFA 16:1 (Hexadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IM181Compatible with harmonization
MFA 18:1 (Octadecenoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- MFA 18:1 (Octadecenoic) (gm) — 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
- 2003-2004: DR1IFF_C — MFA 18:1 (Octadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — MFA 18:1 (Octadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — MFA 18:1 (Octadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — MFA 18:1 (Octadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — MFA 18:1 (Octadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — MFA 18:1 (Octadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — MFA 18:1 (Octadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — MFA 18:1 (Octadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — MFA 18:1 (Octadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — MFA 18:1 (Octadecenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IM201Compatible with harmonization
MFA 20:1 (Eicosenoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- MFA 20:1 (Eicosenoic) (gm) — 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
- 2003-2004: DR1IFF_C — MFA 20:1 (Eicosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — MFA 20:1 (Eicosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — MFA 20:1 (Eicosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — MFA 20:1 (Eicosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — MFA 20:1 (Eicosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — MFA 20:1 (Eicosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — MFA 20:1 (Eicosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — MFA 20:1 (Eicosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — MFA 20:1 (Eicosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — MFA 20:1 (Eicosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IM221Compatible with harmonization
MFA 22:1 (Docosenoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- MFA 22:1 (Docosenoic) (gm) — 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
- 2003-2004: DR1IFF_C — MFA 22:1 (Docosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — MFA 22:1 (Docosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — MFA 22:1 (Docosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — MFA 22:1 (Docosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — MFA 22:1 (Docosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — MFA 22:1 (Docosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — MFA 22:1 (Docosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — MFA 22:1 (Docosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — MFA 22:1 (Docosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — MFA 22:1 (Docosenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IMAGNCompatible with harmonization
Magnesium (mg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Magnesium (mg) — 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
- 2003-2004: DR1IFF_C — Magnesium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Magnesium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Magnesium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Magnesium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Magnesium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Magnesium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Magnesium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Magnesium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Magnesium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Magnesium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IMFATCompatible with harmonization
Total monounsaturated fatty acids (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Total monounsaturated fatty acids (gm) — 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
- 2003-2004: DR1IFF_C — Total monounsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Total monounsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Total monounsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Total monounsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Total monounsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Total monounsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Total monounsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Total monounsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Total monounsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Total monounsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IMOISCompatible with harmonization
Moisture (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Moisture (gm) — 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
- 2003-2004: DR1IFF_C — Moisture (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Moisture (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Moisture (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Moisture (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Moisture (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Moisture (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Moisture (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Moisture (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Moisture (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Moisture (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1INIACCompatible with harmonization
Niacin (mg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Niacin (mg) — 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
- 2003-2004: DR1IFF_C — Niacin (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Niacin (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Niacin (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Niacin (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Niacin (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Niacin (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Niacin (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Niacin (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Niacin (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Niacin (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IP182Compatible with harmonization
PFA 18:2 (Octadecadienoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- PFA 18:2 (Octadecadienoic) (gm) — 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
- 2003-2004: DR1IFF_C — PFA 18:2 (Octadecadienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — PFA 18:2 (Octadecadienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — PFA 18:2 (Octadecadienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — PFA 18:2 (Octadecadienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — PFA 18:2 (Octadecadienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — PFA 18:2 (Octadecadienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — PFA 18:2 (Octadecadienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — PFA 18:2 (Octadecadienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — PFA 18:2 (Octadecadienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — PFA 18:2 (Octadecadienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IP183Compatible with harmonization
PFA 18:3 (Octadecatrienoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- PFA 18:3 (Octadecatrienoic) (gm) — 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
- 2003-2004: DR1IFF_C — PFA 18:3 (Octadecatrienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — PFA 18:3 (Octadecatrienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — PFA 18:3 (Octadecatrienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — PFA 18:3 (Octadecatrienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — PFA 18:3 (Octadecatrienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — PFA 18:3 (Octadecatrienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — PFA 18:3 (Octadecatrienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — PFA 18:3 (Octadecatrienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — PFA 18:3 (Octadecatrienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — PFA 18:3 (Octadecatrienoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IP184Compatible with harmonization
PFA 18:4 (Octadecatetraenoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- PFA 18:4 (Octadecatetraenoic) (gm) — 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
- 2003-2004: DR1IFF_C — PFA 18:4 (Octadecatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — PFA 18:4 (Octadecatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — PFA 18:4 (Octadecatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — PFA 18:4 (Octadecatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — PFA 18:4 (Octadecatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — PFA 18:4 (Octadecatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — PFA 18:4 (Octadecatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — PFA 18:4 (Octadecatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — PFA 18:4 (Octadecatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — PFA 18:4 (Octadecatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IP204Compatible with harmonization
PFA 20:4 (Eicosatetraenoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- PFA 20:4 (Eicosatetraenoic) (gm) — 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
- 2003-2004: DR1IFF_C — PFA 20:4 (Eicosatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — PFA 20:4 (Eicosatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — PFA 20:4 (Eicosatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — PFA 20:4 (Eicosatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — PFA 20:4 (Eicosatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — PFA 20:4 (Eicosatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — PFA 20:4 (Eicosatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — PFA 20:4 (Eicosatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — PFA 20:4 (Eicosatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — PFA 20:4 (Eicosatetraenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IP205Compatible with harmonization
PFA 20:5 (Eicosapentaenoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- PFA 20:5 (Eicosapentaenoic) (gm) — 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
- 2003-2004: DR1IFF_C — PFA 20:5 (Eicosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — PFA 20:5 (Eicosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — PFA 20:5 (Eicosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — PFA 20:5 (Eicosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — PFA 20:5 (Eicosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — PFA 20:5 (Eicosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — PFA 20:5 (Eicosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — PFA 20:5 (Eicosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — PFA 20:5 (Eicosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — PFA 20:5 (Eicosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IP225Compatible with harmonization
PFA 22:5 (Docosapentaenoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- PFA 22:5 (Docosapentaenoic) (gm) — 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
- 2003-2004: DR1IFF_C — PFA 22:5 (Docosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — PFA 22:5 (Docosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — PFA 22:5 (Docosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — PFA 22:5 (Docosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — PFA 22:5 (Docosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — PFA 22:5 (Docosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — PFA 22:5 (Docosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — PFA 22:5 (Docosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — PFA 22:5 (Docosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — PFA 22:5 (Docosapentaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IP226Compatible with harmonization
PFA 22:6 (Docosahexaenoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- PFA 22:6 (Docosahexaenoic) (gm) — 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
- 2003-2004: DR1IFF_C — PFA 22:6 (Docosahexaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — PFA 22:6 (Docosahexaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — PFA 22:6 (Docosahexaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — PFA 22:6 (Docosahexaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — PFA 22:6 (Docosahexaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — PFA 22:6 (Docosahexaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — PFA 22:6 (Docosahexaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — PFA 22:6 (Docosahexaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — PFA 22:6 (Docosahexaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — PFA 22:6 (Docosahexaenoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IPFATCompatible with harmonization
Total polyunsaturated fatty acids (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Total polyunsaturated fatty acids (gm) — 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
- 2003-2004: DR1IFF_C — Total polyunsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Total polyunsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Total polyunsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Total polyunsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Total polyunsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Total polyunsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Total polyunsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Total polyunsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Total polyunsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Total polyunsaturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IPHOSCompatible with harmonization
Phosphorus (mg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Phosphorus (mg) — 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
- 2003-2004: DR1IFF_C — Phosphorus (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Phosphorus (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Phosphorus (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Phosphorus (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Phosphorus (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Phosphorus (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Phosphorus (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Phosphorus (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Phosphorus (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Phosphorus (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IPOTACompatible with harmonization
Potassium (mg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Potassium (mg) — 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
- 2003-2004: DR1IFF_C — Potassium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Potassium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Potassium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Potassium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Potassium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Potassium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Potassium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Potassium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Potassium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Potassium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IPROTCompatible with harmonization
Protein (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Protein (gm) — 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
- 2003-2004: DR1IFF_C — Protein (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Protein (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Protein (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Protein (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Protein (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Protein (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Protein (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Protein (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Protein (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Protein (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IRETCompatible with harmonization
Retinol (mcg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Retinol (mcg) — 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
- 2003-2004: DR1IFF_C — Retinol (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Retinol (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Retinol (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Retinol (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Retinol (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Retinol (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Retinol (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Retinol (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Retinol (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Retinol (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IS040Compatible with harmonization
SFA 4:0 (Butanoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- SFA 4:0 (Butanoic) (gm) — 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
- 2003-2004: DR1IFF_C — SFA 4:0 (Butanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — SFA 4:0 (Butanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — SFA 4:0 (Butanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — SFA 4:0 (Butanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — SFA 4:0 (Butanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — SFA 4:0 (Butanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — SFA 4:0 (Butanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — SFA 4:0 (Butanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — SFA 4:0 (Butanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — SFA 4:0 (Butanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IS060Compatible with harmonization
SFA 6:0 (Hexanoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- SFA 6:0 (Hexanoic) (gm) — 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
- 2003-2004: DR1IFF_C — SFA 6:0 (Hexanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — SFA 6:0 (Hexanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — SFA 6:0 (Hexanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — SFA 6:0 (Hexanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — SFA 6:0 (Hexanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — SFA 6:0 (Hexanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — SFA 6:0 (Hexanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — SFA 6:0 (Hexanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — SFA 6:0 (Hexanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — SFA 6:0 (Hexanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IS080Compatible with harmonization
SFA 8:0 (Octanoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- SFA 8:0 (Octanoic) (gm) — 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
- 2003-2004: DR1IFF_C — SFA 8:0 (Octanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — SFA 8:0 (Octanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — SFA 8:0 (Octanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — SFA 8:0 (Octanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — SFA 8:0 (Octanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — SFA 8:0 (Octanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — SFA 8:0 (Octanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — SFA 8:0 (Octanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — SFA 8:0 (Octanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — SFA 8:0 (Octanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IS100Compatible with harmonization
SFA 10:0 (Decanoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- SFA 10:0 (Decanoic) (gm) — 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
- 2003-2004: DR1IFF_C — SFA 10:0 (Decanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — SFA 10:0 (Decanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — SFA 10:0 (Decanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — SFA 10:0 (Decanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — SFA 10:0 (Decanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — SFA 10:0 (Decanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — SFA 10:0 (Decanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — SFA 10:0 (Decanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — SFA 10:0 (Decanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — SFA 10:0 (Decanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IS120Compatible with harmonization
SFA 12:0 (Dodecanoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- SFA 12:0 (Dodecanoic) (gm) — 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
- 2003-2004: DR1IFF_C — SFA 12:0 (Dodecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — SFA 12:0 (Dodecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — SFA 12:0 (Dodecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — SFA 12:0 (Dodecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — SFA 12:0 (Dodecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — SFA 12:0 (Dodecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — SFA 12:0 (Dodecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — SFA 12:0 (Dodecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — SFA 12:0 (Dodecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — SFA 12:0 (Dodecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IS140Compatible with harmonization
SFA 14:0 (Tetradecanoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- SFA 14:0 (Tetradecanoic) (gm) — 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
- 2003-2004: DR1IFF_C — SFA 14:0 (Tetradecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — SFA 14:0 (Tetradecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — SFA 14:0 (Tetradecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — SFA 14:0 (Tetradecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — SFA 14:0 (Tetradecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — SFA 14:0 (Tetradecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — SFA 14:0 (Tetradecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — SFA 14:0 (Tetradecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — SFA 14:0 (Tetradecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — SFA 14:0 (Tetradecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IS160Compatible with harmonization
SFA 16:0 (Hexadecanoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- SFA 16:0 (Hexadecanoic) (gm) — 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
- 2003-2004: DR1IFF_C — SFA 16:0 (Hexadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — SFA 16:0 (Hexadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — SFA 16:0 (Hexadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — SFA 16:0 (Hexadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — SFA 16:0 (Hexadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — SFA 16:0 (Hexadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — SFA 16:0 (Hexadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — SFA 16:0 (Hexadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — SFA 16:0 (Hexadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — SFA 16:0 (Hexadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IS180Compatible with harmonization
SFA 18:0 (Octadecanoic) (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- SFA 18:0 (Octadecanoic) (gm) — 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
- 2003-2004: DR1IFF_C — SFA 18:0 (Octadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — SFA 18:0 (Octadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — SFA 18:0 (Octadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — SFA 18:0 (Octadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — SFA 18:0 (Octadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — SFA 18:0 (Octadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — SFA 18:0 (Octadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — SFA 18:0 (Octadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — SFA 18:0 (Octadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — SFA 18:0 (Octadecanoic) (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1ISELECompatible with harmonization
Selenium (mcg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Selenium (mcg) — 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
- 2003-2004: DR1IFF_C — Selenium (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Selenium (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Selenium (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Selenium (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Selenium (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Selenium (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Selenium (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Selenium (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Selenium (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Selenium (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1ISFATCompatible with harmonization
Total saturated fatty acids (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Total saturated fatty acids (gm) — 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
- 2003-2004: DR1IFF_C — Total saturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Total saturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Total saturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Total saturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Total saturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Total saturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Total saturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Total saturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Total saturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Total saturated fatty acids (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1ISODICompatible with harmonization
Sodium (mg)(adjusted for salt use in food preparation)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Sodium (mg)(adjusted for salt use in food preparation) — 2003-2004 · 2005-2006 · 2007-2008
- Sodium (mg) — 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 2003-2004: DR1IFF_C — Sodium (mg)(adjusted for salt use in food preparation) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Sodium (mg)(adjusted for salt use in food preparation) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Sodium (mg)(adjusted for salt use in food preparation) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Sodium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Sodium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Sodium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Sodium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Sodium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Sodium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Sodium (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1ISUGRCompatible with harmonization
Total sugars (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Total sugars (gm) — 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
- 2003-2004: DR1IFF_C — Total sugars (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Total sugars (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Total sugars (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Total sugars (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Total sugars (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Total sugars (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Total sugars (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Total sugars (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Total sugars (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Total sugars (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1ITFATCompatible with harmonization
Total fat (gm)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Total fat (gm) — 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
- 2003-2004: DR1IFF_C — Total fat (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Total fat (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Total fat (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Total fat (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Total fat (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Total fat (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Total fat (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Total fat (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Total fat (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Total fat (gm) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1ITHEOCompatible with harmonization
Theobromine (mg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Theobromine (mg) — 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
- 2003-2004: DR1IFF_C — Theobromine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Theobromine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Theobromine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Theobromine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Theobromine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Theobromine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Theobromine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Theobromine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Theobromine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Theobromine (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IVARACompatible with harmonization
Vitamin A as retinol activity equivalents (mcg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Vitamin A as retinol activity equivalents (mcg) — 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
- 2003-2004: DR1IFF_C — Vitamin A as retinol activity equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Vitamin A as retinol activity equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Vitamin A as retinol activity equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Vitamin A as retinol activity equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Vitamin A as retinol activity equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Vitamin A as retinol activity equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Vitamin A as retinol activity equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Vitamin A as retinol activity equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Vitamin A as retinol activity equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Vitamin A as retinol activity equivalents (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IVB1Compatible with harmonization
Thiamin (Vitamin B1) (mg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Thiamin (Vitamin B1) (mg) — 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
- 2003-2004: DR1IFF_C — Thiamin (Vitamin B1) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Thiamin (Vitamin B1) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Thiamin (Vitamin B1) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Thiamin (Vitamin B1) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Thiamin (Vitamin B1) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Thiamin (Vitamin B1) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Thiamin (Vitamin B1) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Thiamin (Vitamin B1) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Thiamin (Vitamin B1) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Thiamin (Vitamin B1) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IVB12Compatible with harmonization
Vitamin B12 (mcg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Vitamin B12 (mcg) — 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
- 2003-2004: DR1IFF_C — Vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Vitamin B12 (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IVB2Compatible with harmonization
Riboflavin (Vitamin B2) (mg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Riboflavin (Vitamin B2) (mg) — 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
- 2003-2004: DR1IFF_C — Riboflavin (Vitamin B2) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Riboflavin (Vitamin B2) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Riboflavin (Vitamin B2) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Riboflavin (Vitamin B2) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Riboflavin (Vitamin B2) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Riboflavin (Vitamin B2) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Riboflavin (Vitamin B2) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Riboflavin (Vitamin B2) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Riboflavin (Vitamin B2) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Riboflavin (Vitamin B2) (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IVB6Compatible with harmonization
Vitamin B6 (mg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Vitamin B6 (mg) — 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
- 2003-2004: DR1IFF_C — Vitamin B6 (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Vitamin B6 (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Vitamin B6 (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Vitamin B6 (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Vitamin B6 (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Vitamin B6 (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Vitamin B6 (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Vitamin B6 (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Vitamin B6 (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Vitamin B6 (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IVCCompatible with harmonization
Vitamin C (mg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Vitamin C (mg) — 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
- 2003-2004: DR1IFF_C — Vitamin C (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Vitamin C (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Vitamin C (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Vitamin C (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Vitamin C (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Vitamin C (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Vitamin C (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Vitamin C (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Vitamin C (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Vitamin C (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IVDCompatible with harmonization
Vitamin D (D2 + D3) (mcg)
- Observed years
- 2007–2023
- Release records
- 8
- Datasets
- 8
- Components
- Dietary
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 · 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.
- 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.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Vitamin D (D2 + D3) (mcg) — 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 2007-2008: DR1IFF_E — Vitamin D (D2 + D3) (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Vitamin D (D2 + D3) (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Vitamin D (D2 + D3) (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Vitamin D (D2 + D3) (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Vitamin D (D2 + D3) (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Vitamin D (D2 + D3) (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Vitamin D (D2 + D3) (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Vitamin D (D2 + D3) (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IVKCompatible with harmonization
Vitamin K (mcg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Vitamin K (mcg) — 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
- 2003-2004: DR1IFF_C — Vitamin K (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Vitamin K (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Vitamin K (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Vitamin K (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Vitamin K (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Vitamin K (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Vitamin K (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Vitamin K (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Vitamin K (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Vitamin K (mcg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1IZINCCompatible with harmonization
Zinc (mg)
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Variable names / labels over time
- Zinc (mg) — 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
- 2003-2004: DR1IFF_C — Zinc (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Zinc (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Zinc (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Zinc (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Zinc (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Zinc (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Zinc (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Zinc (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Zinc (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Zinc (mg) — Dietary Interview - Individual Foods, First Day (Dietary)
DR1LANGCompatible with harmonization
The SP/Proxy spoke mostly:
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- Confirm that the construct and coding are unchanged before pooling or recoding.
- 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.
Supporting CDC/NCHS evidence
- Source evidence 1
- Source evidence 2
- Source evidence 3
- Source evidence 4
- Source evidence 5
- Source evidence 6
- Source evidence 7
- Source evidence 8
- Source evidence 9
- Source evidence 10
- Source evidence 11
- Source evidence 12
- Source evidence 13
- Source evidence 14
- Source evidence 15
- Source evidence 16
- Source evidence 17
- Source evidence 18
- Source evidence 19
- Source evidence 20
- Source evidence 21
- Source evidence 22
- Source evidence 23
- Source evidence 24
- Source evidence 25
- Source evidence 26
- Source evidence 27
- Source evidence 28
- Source evidence 29
- Source evidence 30
Variable names / labels over time
- The SP/Proxy spoke mostly: — 2003-2004
- The respondent spoke mostly: — 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 2003-2004: DR1IFF_C — The SP/Proxy spoke mostly: — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — The respondent spoke mostly: — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — The respondent spoke mostly: — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — The respondent spoke mostly: — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — The respondent spoke mostly: — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — The respondent spoke mostly: — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — The respondent spoke mostly: — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — The respondent spoke mostly: — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — The respondent spoke mostly: — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — The respondent spoke mostly: — Dietary Interview - Individual Foods, First Day (Dietary)
DR1MCCompatible with harmonization
Modification code
- Observed years
- 2003–2012
- Release records
- 5
- Datasets
- 5
- Components
- Dietary
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
Praxis harmonization actions
- 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.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Modification code — 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012
Cycle-by-cycle release history
- 2003-2004: DR1IFF_C — Modification code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Modification code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Modification code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Modification code — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Modification code — Dietary Interview - Individual Foods, First Day (Dietary)
DRABFCompatible with harmonization
Indicates whether the sample person was an infant who was breast-fed on either of the two recall days.
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
- Confirm that the construct and coding are unchanged before pooling or recoding.
- 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
- Source evidence 1
- Source evidence 2
- Source evidence 3
- Source evidence 4
- Source evidence 5
- Source evidence 6
- Source evidence 7
- Source evidence 8
- Source evidence 9
- Source evidence 10
- Source evidence 11
- Source evidence 12
- Source evidence 13
- Source evidence 14
- Source evidence 15
- Source evidence 16
- Source evidence 17
- Source evidence 18
- Source evidence 19
- Source evidence 20
- Source evidence 21
- Source evidence 22
- Source evidence 23
- Source evidence 24
- Source evidence 25
- Source evidence 26
- Source evidence 27
- Source evidence 28
- Source evidence 29
- Source evidence 30
- Source evidence 31
- Source evidence 32
- Source evidence 33
- Source evidence 34
- Source evidence 35
- Source evidence 36
Variable names / labels over time
- Indicates whether the sample person was an infant who was breast-fed on either of the two recall days. — 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
- 2003-2004: DR1IFF_C — Indicates whether the sample person was an infant who was breast-fed on either of the two recall days. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Indicates whether the sample person was an infant who was breast-fed on either of the two recall days. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Indicates whether the sample person was an infant who was breast-fed on either of the two recall days. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Indicates whether the sample person was an infant who was breast-fed on either of the two recall days. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Indicates whether the sample person was an infant who was breast-fed on either of the two recall days. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Indicates whether the sample person was an infant who was breast-fed on either of the two recall days. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Indicates whether the sample person was an infant who was breast-fed on either of the two recall days. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Indicates whether the sample person was an infant who was breast-fed on either of the two recall days. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Indicates whether the sample person was an infant who was breast-fed on either of the two recall days. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Indicates whether the sample person was an infant who was breast-fed on either of the two recall days. — Dietary Interview - Individual Foods, First Day (Dietary)
DRDINTCompatible with harmonization
Indicates whether the sample person has intake data for one or two days.
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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 · 2017-2020 → 2021-2023
Praxis harmonization actions
- 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.
Supporting CDC/NCHS evidence
- Source evidence 1
- Source evidence 2
- Source evidence 3
- Source evidence 4
- Source evidence 5
- Source evidence 6
- Source evidence 7
- Source evidence 8
- Source evidence 9
- Source evidence 10
- Source evidence 11
- Source evidence 12
- Source evidence 13
- Source evidence 14
- Source evidence 15
- Source evidence 16
- Source evidence 17
- Source evidence 18
- Source evidence 19
- Source evidence 20
- Source evidence 21
- Source evidence 22
- Source evidence 23
- Source evidence 24
- Source evidence 25
- Source evidence 26
- Source evidence 27
- Source evidence 28
- Source evidence 29
- Source evidence 30
- Source evidence 31
- Source evidence 32
- Source evidence 33
- Source evidence 34
- Source evidence 35
- Source evidence 36
- Source evidence 37
- Source evidence 38
- Source evidence 39
- Source evidence 40
- Source evidence 41
- Source evidence 42
- Source evidence 43
- Source evidence 44
- Source evidence 45
- Source evidence 46
- Source evidence 47
- Source evidence 48
- Source evidence 49
- Source evidence 50
- Source evidence 51
- Source evidence 52
- Source evidence 53
- Source evidence 54
- Source evidence 55
- Source evidence 56
- Source evidence 57
- Source evidence 58
- Source evidence 59
- Source evidence 60
- Source evidence 61
Variable names / labels over time
- Indicates whether the sample person has intake data for one or two days. — 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
- 2003-2004: DR1IFF_C — Indicates whether the sample person has intake data for one or two days. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Indicates whether the sample person has intake data for one or two days. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Indicates whether the sample person has intake data for one or two days. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Indicates whether the sample person has intake data for one or two days. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Indicates whether the sample person has intake data for one or two days. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Indicates whether the sample person has intake data for one or two days. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Indicates whether the sample person has intake data for one or two days. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Indicates whether the sample person has intake data for one or two days. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Indicates whether the sample person has intake data for one or two days. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Indicates whether the sample person has intake data for one or two days. — Dietary Interview - Individual Foods, First Day (Dietary)
SEQNAdjustment required
Respondent sequence number.
- Observed years
- 2003–2023
- Release records
- 10
- Datasets
- 10
- Components
- Dietary
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
- Source evidence 1
- Source evidence 2
- Source evidence 3
- Source evidence 4
- Source evidence 5
- Source evidence 6
- Source evidence 7
- Source evidence 8
- Source evidence 9
- Source evidence 10
- Source evidence 11
- Source evidence 12
- Source evidence 13
- Source evidence 14
- Source evidence 15
- Source evidence 16
- Source evidence 17
- Source evidence 18
- Source evidence 19
- Source evidence 20
- Source evidence 21
- Source evidence 22
- Source evidence 23
- Source evidence 24
- Source evidence 25
- Source evidence 26
- Source evidence 27
- Source evidence 28
- Source evidence 29
- Source evidence 30
- Source evidence 31
- Source evidence 32
- Source evidence 33
- Source evidence 34
- Source evidence 35
- Source evidence 36
- Source evidence 37
- Source evidence 38
- Source evidence 39
- Source evidence 40
- Source evidence 41
- Source evidence 42
- Source evidence 43
- Source evidence 44
- Source evidence 45
- Source evidence 46
- Source evidence 47
- Source evidence 48
- Source evidence 49
- Source evidence 50
- Source evidence 51
- Source evidence 52
- Source evidence 53
- Source evidence 54
- Source evidence 55
- Source evidence 56
- Source evidence 57
- Source evidence 58
- Source evidence 59
- Source evidence 60
- Source evidence 61
- Source evidence 62
- Source evidence 63
- Source evidence 64
- Source evidence 65
- Source evidence 66
- Source evidence 67
- Source evidence 68
- Source evidence 69
- Source evidence 70
- Source evidence 71
- Source evidence 72
- Source evidence 73
- Source evidence 74
- Source evidence 75
- Source evidence 76
- Source evidence 77
- Source evidence 78
- Source evidence 79
- Source evidence 80
- Source evidence 81
- Source evidence 82
- Source evidence 83
- Source evidence 84
- Source evidence 85
- Source evidence 86
- Source evidence 87
- Source evidence 88
- Source evidence 89
- Source evidence 90
- Source evidence 91
- Source evidence 92
- Source evidence 93
- Source evidence 94
- Source evidence 95
- Source evidence 96
- Source evidence 97
- Source evidence 98
- Source evidence 99
- Source evidence 100
- Source evidence 101
- Source evidence 102
- Source evidence 103
- Source evidence 104
- Source evidence 105
- Source evidence 106
- Source evidence 107
- Source evidence 108
- Source evidence 109
- Source evidence 110
- Source evidence 111
- Source evidence 112
- Source evidence 113
- Source evidence 114
- Source evidence 115
- Source evidence 116
- Source evidence 117
- Source evidence 118
- Source evidence 119
- Source evidence 120
- Source evidence 121
- Source evidence 122
- Source evidence 123
- Source evidence 124
- Source evidence 125
- Source evidence 126
- Source evidence 127
- Source evidence 128
- Source evidence 129
- Source evidence 130
- Source evidence 131
- Source evidence 132
- Source evidence 133
- Source evidence 134
- Source evidence 135
- Source evidence 136
- Source evidence 137
- Source evidence 138
- Source evidence 139
- Source evidence 140
- Source evidence 141
- Source evidence 142
- Source evidence 143
- Source evidence 144
- Source evidence 145
- Source evidence 146
- Source evidence 147
- Source evidence 148
- Source evidence 149
- Source evidence 150
- Source evidence 151
- Source evidence 152
- Source evidence 153
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- Source evidence 155
- Source evidence 156
- Source evidence 157
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- Source evidence 159
- Source evidence 160
- Source evidence 161
- Source evidence 162
- Source evidence 163
- Source evidence 164
- Source evidence 165
- Source evidence 166
- Source evidence 167
- Source evidence 168
- Source evidence 169
- Source evidence 170
- Source evidence 171
- Source evidence 172
- Source evidence 173
- Source evidence 174
- Source evidence 175
- Source evidence 176
- Source evidence 177
- Source evidence 178
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Variable names / labels over time
- Respondent sequence number. — 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
- 2003-2004: DR1IFF_C — Respondent sequence number. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Respondent sequence number. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Respondent sequence number. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Respondent sequence number. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Respondent sequence number. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Respondent sequence number. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Respondent sequence number. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Respondent sequence number. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2020: P_DR1IFF — Respondent sequence number. — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Respondent sequence number. — Dietary Interview - Individual Foods, First Day (Dietary)
WTDR2DCompatible with harmonization
Dietary two-day sample weight
- Observed years
- 2003–2023
- Release records
- 9
- Datasets
- 9
- Components
- Dietary
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 → 2021-2023
Praxis harmonization actions
- 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.
Supporting CDC/NCHS evidence
- Source evidence 1
- Source evidence 2
- Source evidence 3
- Source evidence 4
- Source evidence 5
- Source evidence 6
- Source evidence 7
- Source evidence 8
- Source evidence 9
- Source evidence 10
- Source evidence 11
- Source evidence 12
- Source evidence 13
- Source evidence 14
- Source evidence 15
- Source evidence 16
- Source evidence 17
- Source evidence 18
- Source evidence 19
- Source evidence 20
- Source evidence 21
- Source evidence 22
- Source evidence 23
- Source evidence 24
- Source evidence 25
- Source evidence 26
- Source evidence 27
- Source evidence 28
- Source evidence 29
- Source evidence 30
- Source evidence 31
- Source evidence 32
- Source evidence 33
- Source evidence 34
- Source evidence 35
- Source evidence 36
- Source evidence 37
- Source evidence 38
- Source evidence 39
- Source evidence 40
- Source evidence 41
- Source evidence 42
- Source evidence 43
- Source evidence 44
- Source evidence 45
- Source evidence 46
- Source evidence 47
- Source evidence 48
- Source evidence 49
- Source evidence 50
- Source evidence 51
- Source evidence 52
Variable names / labels over time
- Dietary two-day sample weight — 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2021-2023
Cycle-by-cycle release history
- 2003-2004: DR1IFF_C — Dietary two-day sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Dietary two-day sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Dietary two-day sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Dietary two-day sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Dietary two-day sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Dietary two-day sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Dietary two-day sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Dietary two-day sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Dietary two-day sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
WTDR2DPPEvidence developing
Dietary two-day sample weight
- Observed years
- 2017–2020
- Release records
- 1
- Datasets
- 1
- Components
- Dietary
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
- Dietary two-day sample weight — 2017-2020
Cycle-by-cycle release history
- 2017-2020: P_DR1IFF — Dietary two-day sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
WTDRD1Compatible with harmonization
Dietary day one sample weight
- Observed years
- 2003–2023
- Release records
- 9
- Datasets
- 9
- Components
- Dietary
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 · 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.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
Supporting CDC/NCHS evidence
- Source evidence 1
- Source evidence 2
- Source evidence 3
- Source evidence 4
- Source evidence 5
- Source evidence 6
- Source evidence 7
- Source evidence 8
- Source evidence 9
- Source evidence 10
- Source evidence 11
- Source evidence 12
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- Source evidence 47
- Source evidence 48
- Source evidence 49
- Source evidence 50
- Source evidence 51
- Source evidence 52
- Source evidence 53
- Source evidence 54
- Source evidence 55
- Source evidence 56
Variable names / labels over time
- Dietary day one sample weight — 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2021-2023
Cycle-by-cycle release history
- 2003-2004: DR1IFF_C — Dietary day one sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
- 2005-2006: DR1IFF_D — Dietary day one sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
- 2007-2008: DR1IFF_E — Dietary day one sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
- 2009-2010: DR1IFF_F — Dietary day one sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
- 2011-2012: DR1IFF_G — Dietary day one sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
- 2013-2014: DR1IFF_H — Dietary day one sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
- 2015-2016: DR1IFF_I — Dietary day one sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
- 2017-2018: DR1IFF_J — Dietary day one sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
- 2021-2023: DR1IFF_L — Dietary day one sample weight — Dietary Interview - Individual Foods, First Day (Dietary)
WTDRD1PPEvidence developing
Dietary day one sample weight
- Observed years
- 2017–2020
- Release records
- 1
- Datasets
- 1
- Components
- Dietary
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
- Dietary day one sample weight — 2017-2020
Cycle-by-cycle release history
- 2017-2020: P_DR1IFF — Dietary day one sample weight — Dietary Interview - Individual Foods, First Day (Dietary)