Harmonization summary
1 label-stable codes
- Label changes detected
- 0
- Multiple dataset contexts
- 0
- 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
5 release records across 5 datasets and 5 cycles.
Search scope
Results for “RIDEXAGM”
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.
RIDEXAGMCompatible with harmonization
Age in months of the participant at the time of examination. Reported for persons aged 19 years or younger at the time of examination.
- Observed years
- 2011–2023
- Release records
- 5
- Datasets
- 5
- Components
- Demographics
Qualified Praxis harmonization assessment
Compatible with harmonization · moderate confidence
No blocking method discontinuity is identified inside the selected cycle span, but one or more longitudinal changes require explicit harmonization conditions before pooling.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Relevant boundaries: 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016 · 2015-2016 → 2017-2018 · 2017-2018 → 2021-2023
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Age in months of the participant at the time of examination. Reported for persons aged 19 years or younger at the time of examination. — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2021-2023
Cycle-by-cycle release history
- 2011-2012: DEMO_G — Age in months of the participant at the time of examination. Reported for persons aged 19 years or younger at the time of examination. — Demographic Variables & Sample Weights (Demographics)
- 2013-2014: DEMO_H — Age in months of the participant at the time of examination. Reported for persons aged 19 years or younger at the time of examination. — Demographic Variables and Sample Weights (Demographics)
- 2015-2016: DEMO_I — Age in months of the participant at the time of examination. Reported for persons aged 19 years or younger at the time of examination. — Demographic Variables and Sample Weights (Demographics)
- 2017-2018: DEMO_J — Age in months of the participant at the time of examination. Reported for persons aged 19 years or younger at the time of examination. — Demographic Variables and Sample Weights (Demographics)
- 2021-2023: DEMO_L — Age in months of the participant at the time of examination. Reported for persons aged 19 years or younger at the time of examination. — Demographic Variables and Sample Weights (Demographics)