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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.

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Search scope

Results for “ALD040”

Harmonization summary

0 label-stable codes

Label changes detected
1
Multiple dataset contexts
1
Unique codes
1
Enriched codes in this report
0

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.

ALD040Compatible with harmonization

During the past 30 days, on how many days did you have 5 or more drinks of alcohol in a row, that is, within a couple of hours?

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.
  • Confirm that the construct and coding are unchanged before pooling or recoding.
Supporting CDC/NCHS evidence
Variable names / labels over time
  • During the past 30 days, on how many days did you have 5 or more drinks of alcohol in a row, that is, within a couple of hours? — 1999-2000 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012
  • During the past 30 days, on how many days did you have {DISPLAY NUMBER} or more drinks of alcohol in a row, that is, within a couple of hours? — 2013-2014 · 2021-2023
  • During the past 30 days, on how many days did you have {'4' Female, '5' Male - DISPLAY NUMBER} or more drinks of alcohol in a row, that is, within a couple of hours? — 2015-2016 · 2017-2018 · 2017-2020
Cycle-by-cycle release history
  • 1999-2000: ALQYTH — During the past 30 days, on how many days did you have 5 or more drinks of alcohol in a row, that is, within a couple of hours? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only
  • 2005-2006: ALQYTH_D — During the past 30 days, on how many days did you have 5 or more drinks of alcohol in a row, that is, within a couple of hours? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only
  • 2007-2008: ALQYTH_E — During the past 30 days, on how many days did you have 5 or more drinks of alcohol in a row, that is, within a couple of hours? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only
  • 2009-2010: ALQY_F — During the past 30 days, on how many days did you have 5 or more drinks of alcohol in a row, that is, within a couple of hours? — Alcohol Use (Ages 18-19) (Questionnaire)
  • 2009-2010: ALQY_F_R — During the past 30 days, on how many days did you have 5 or more drinks of alcohol in a row, that is, within a couple of hours? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only
  • 2011-2012: ALQY_G_R — During the past 30 days, on how many days did you have 5 or more drinks of alcohol in a row, that is, within a couple of hours? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only
  • 2013-2014: ALQY_H_R — During the past 30 days, on how many days did you have {DISPLAY NUMBER} or more drinks of alcohol in a row, that is, within a couple of hours? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only
  • 2015-2016: ALQY_I_R — During the past 30 days, on how many days did you have {'4' Female, '5' Male - DISPLAY NUMBER} or more drinks of alcohol in a row, that is, within a couple of hours? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only
  • 2017-2018: ALQY_J_R — During the past 30 days, on how many days did you have {'4' Female, '5' Male - DISPLAY NUMBER} or more drinks of alcohol in a row, that is, within a couple of hours? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only
  • 2017-2020: P_ALQY_R — During the past 30 days, on how many days did you have {'4' Female, '5' Male - DISPLAY NUMBER} or more drinks of alcohol in a row, that is, within a couple of hours? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only
  • 2021-2023: ALQY_L_R — During the past 30 days, on how many days did you have {DISPLAY NUMBER} or more drinks of alcohol in a row, that is, within a couple of hours? — Alcohol Use - Youth (Questionnaire) — Note: RDC Only