ALD030Compatible with harmonizationmoderate confidence
Questionnaire
During the past 30 days, on how many days did you have at least one drink of alcohol?
- Source releases
- 11
- Available cycles
- 1999-2000 · 2005-2006 · 2007-2008 · 2009-2010 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
- Dataset
- Alcohol Use - Youth
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
Evidence signals: source-derived
Relevant boundaries: 1999-2000 → 2005-2006 · 2005-2006 → 2007-2008 · 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.
Supporting CDC/NCHS evidence
BPD035Compatible with harmonizationmoderate confidence
Questionnaire
How old {were you/was SP} when {you were/he/she was} first told that {you/he/she} had hypertension or high blood pressure?
- Source releases
- 7
- Available cycles
- 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
- Dataset
- Blood Pressure & Cholesterol
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
Evidence signals: source-derived
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
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
DCDINDEXCompatible with harmonizationmoderate confidence
Laboratory
- Source releases
- 3
- Available cycles
- 1999-2000 · 2001-2002 · 2003-2004
- Dataset
- Lead - Dust
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
Evidence signals: source-derived · automated-difference
Relevant boundaries: 1999-2000 → 2001-2002 · 2001-2002 → 2003-2004
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- 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
