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 “GTDSCMMN”
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.
GTDSCMMNAdjustment required
Glucose challenge Administer Time in minutes
- Observed years
- 2007–2016
- Release records
- 5
- Datasets
- 5
- Components
- Laboratory
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: 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
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.
- 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.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Glucose challenge Administer Time in minutes — 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016
Cycle-by-cycle release history
- 2007-2008: OGTT_E — Glucose challenge Administer Time in minutes — Oral Glucose Tolerance Test (Laboratory)
- 2009-2010: OGTT_F — Glucose challenge Administer Time in minutes — Oral Glucose Tolerance Test (Laboratory)
- 2011-2012: OGTT_G — Glucose challenge Administer Time in minutes — Oral Glucose Tolerance Test (Laboratory)
- 2013-2014: OGTT_H — Glucose challenge Administer Time in minutes — Oral Glucose Tolerance Test (Laboratory)
- 2015-2016: OGTT_I — Glucose challenge Administer Time in minutes — Oral Glucose Tolerance Test (Laboratory)