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

BMXBMI
Compatiblehigh confidence

Examination

Body Mass Index (kg/m**2)

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. BMI remains the derived construct of weight in kilograms divided by standing height in meters squared. Indexed differences for this variable are limited to dataset context and documentation wording, not a confirmed measurement or calculation discontinuity.

Evidence provenance: CDC/NCHS source-confirmed evidence · Praxis deterministic adjudication

Evidence signals: source-stated

Praxis harmonization actions
  • Pool BMI across calibrated cycles without a method adjustment when no substantive variable-level change is present. Continue to apply cycle-appropriate NHANES weights, eligibility restrictions, and ordinary analytic guidance.
Supporting CDC/NCHS evidence
Remove from studyVariable historyCDC source