Data intelligence · automation · analyticsA Praxis Global Institute platform
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.

1variable selected
Praxis harmonization check: ready

The selected variables and cycle span have no indexed blocking harmonization boundary.

1 variable assessment

BMXWT
Compatiblehigh confidence

Examination

Weight (kg)

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 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

Evidence signals: source-stated

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
Remove from studyVariable historyCDC source