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
12 release records across 12 datasets and 12 cycles.
Search scope
Results for “BMXWT”
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.
BMXWTCompatible
Weight (kg)
- Observed years
- 1999–2023
- Release records
- 12
- Datasets
- 12
- Components
- Examination
Qualified Praxis harmonization assessment
Compatible · high confidence
CDC/NCHS documentation supports continuity of the core NHANES anthropometry protocol across Continuous NHANES. Indexed differences for body weight are limited to dataset context and documentation wording, not a confirmed measurement discontinuity.
Evidence provenance: CDC/NCHS source-confirmed evidence · Praxis deterministic adjudication
Praxis harmonization actions
- Pool body weight across calibrated cycles without a method adjustment when no substantive variable-level change is present. Review weight comment codes, amputation handling, pregnancy considerations, and cycle-appropriate survey weights.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Weight (kg) — 1999-2000 · 2001-2002 · 2003-2004 · 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: BMX — Weight (kg) — Body Measures (Examination)
- 2001-2002: BMX_B — Weight (kg) — Body Measures (Examination)
- 2003-2004: BMX_C — Weight (kg) — Body Measures (Examination)
- 2005-2006: BMX_D — Weight (kg) — Body Measures (Examination)
- 2007-2008: BMX_E — Weight (kg) — Body Measures (Examination)
- 2009-2010: BMX_F — Weight (kg) — Body Measures (Examination)
- 2011-2012: BMX_G — Weight (kg) — Body Measures (Examination)
- 2013-2014: BMX_H — Weight (kg) — Body Measures (Examination)
- 2015-2016: BMX_I — Weight (kg) — Body Measures (Examination)
- 2017-2018: BMX_J — Weight (kg) — Body Measures (Examination)
- 2017-2020: P_BMX — Weight (kg) — Body Measures (Examination)
- 2021-2023: BMX_L — Weight (kg) — Body Measures (Examination)