Harmonization summary
0 label-stable codes
- Label changes detected
- 0
- Multiple dataset contexts
- 1
- Unique codes
- 1
- 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.
1matching variable codes
11 release records across 11 datasets and 10 cycles.
Search scope
Results for “ALD020”
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.
ALD020Compatible with harmonization
During your life, on how many days have you had at least one drink of alcohol?
- Observed years
- 1999–2023
- Release records
- 11
- Datasets
- 11
- Components
- Questionnaire
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 → 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
Variable names / labels over time
- During your life, on how many days have you had at least one drink of alcohol? — 1999-2000 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Cycle-by-cycle release history
- 1999-2000: ALQYTH — During your life, on how many days have you had at least one drink of alcohol? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only
- 2005-2006: ALQYTH_D — During your life, on how many days have you had at least one drink of alcohol? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only
- 2007-2008: ALQYTH_E — During your life, on how many days have you had at least one drink of alcohol? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only
- 2009-2010: ALQY_F — During your life, on how many days have you had at least one drink of alcohol? — Alcohol Use (Ages 18-19) (Questionnaire)
- 2009-2010: ALQY_F_R — During your life, on how many days have you had at least one drink of alcohol? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only
- 2011-2012: ALQY_G_R — During your life, on how many days have you had at least one drink of alcohol? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only
- 2013-2014: ALQY_H_R — During your life, on how many days have you had at least one drink of alcohol? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only
- 2015-2016: ALQY_I_R — During your life, on how many days have you had at least one drink of alcohol? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only
- 2017-2018: ALQY_J_R — During your life, on how many days have you had at least one drink of alcohol? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only
- 2017-2020: P_ALQY_R — During your life, on how many days have you had at least one drink of alcohol? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only
- 2021-2023: ALQY_L_R — During your life, on how many days have you had at least one drink of alcohol? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only