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Praxis Data Lab

Praxis Data Lab · Study Builder

Build your NHANES study with harmonization intelligence.

Combine variables from the indexed Continuous NHANES catalog, choose the cycles you need, and see how Praxis connects source history, methods, cycle boundaries, and cross-code lineage into a study-specific harmonization view.

2variables selected
Praxis harmonization guidance available

Praxis found harmonization conditions for this study and has surfaced them below with the supporting source evidence.

2 variable assessments

BMXHT
Compatiblehigh confidence

Examination

Standing Height (cm)

Source releases
12
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Dataset
Body Measures

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

Evidence signals: source-stated

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
Remove from studyVariable historyCDC source
DSXDP1LD
Evidence developinglow confidence

Laboratory

Dust mite Dermatophagoides pteronyssinus 1 (Der p 1) dust antigen, limit of detection (ng/mL dust)

Source releases
1
Available cycles
2005-2006
Dataset
Allergens - Household Dust

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

Remove from studyVariable historyCDC source