Harmonization summary
2 label-stable codes
- Label changes detected
- 0
- Multiple dataset contexts
- 0
- Unique codes
- 2
- 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.
2matching variable codes
13 release records across 12 datasets and 12 cycles.
Search scope
Results for “BMXHT”
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.
BMDRECUFEvidence developing
The difference between BMXRECUM and BMXHT for children 24-47 months is > 2.5cm.
- Observed years
- 2003–2004
- Release records
- 1
- Datasets
- 1
- Components
- Examination
Qualified Praxis harmonization assessment
Evidence developing · low confidence
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Variable names / labels over time
- The difference between BMXRECUM and BMXHT for children 24-47 months is > 2.5cm. — 2003-2004
Cycle-by-cycle release history
- 2003-2004: BMX_C — The difference between BMXRECUM and BMXHT for children 24-47 months is > 2.5cm. — Body Measures (Examination)
BMXHTCompatible
Standing Height (cm)
- 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 standing height 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 standing height across calibrated cycles without a method adjustment when no substantive variable-level change is present. Preserve age eligibility and relevant measurement comment-code exclusions.
Supporting CDC/NCHS evidence
Variable names / labels over time
- Standing Height (cm) — 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 — Standing Height (cm) — Body Measures (Examination)
- 2001-2002: BMX_B — Standing Height (cm) — Body Measures (Examination)
- 2003-2004: BMX_C — Standing Height (cm) — Body Measures (Examination)
- 2005-2006: BMX_D — Standing Height (cm) — Body Measures (Examination)
- 2007-2008: BMX_E — Standing Height (cm) — Body Measures (Examination)
- 2009-2010: BMX_F — Standing Height (cm) — Body Measures (Examination)
- 2011-2012: BMX_G — Standing Height (cm) — Body Measures (Examination)
- 2013-2014: BMX_H — Standing Height (cm) — Body Measures (Examination)
- 2015-2016: BMX_I — Standing Height (cm) — Body Measures (Examination)
- 2017-2018: BMX_J — Standing Height (cm) — Body Measures (Examination)
- 2017-2020: P_BMX — Standing Height (cm) — Body Measures (Examination)
- 2021-2023: BMX_L — Standing Height (cm) — Body Measures (Examination)