Praxis Data Lab · Study Builder
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.
Praxis found harmonization conditions for this study and has surfaced them below with the supporting source evidence.
3 variable assessments
Laboratory
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
Examination
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
Demographics
RIDRETH1 is retained as the longitudinal five-category race/Hispanic-origin recode, including after the expanded RIDRETH3 variable was introduced in 2011-2012. CDC/NCHS specifically retained RIDRETH1 to support comparison with earlier Continuous NHANES cycles.
Evidence provenance: CDC/NCHS source-confirmed evidence · Praxis deterministic adjudication
Evidence signals: source-stated