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

AADBDTIM

Evidence developinglow confidence

Laboratory

Bed Vacuum Time (seconds)

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 study Variable history CDC source

BAQ321A

Evidence developinglow confidence

Questionnaire

The next questions are about symptoms of dizziness, light-headedness, or balance problems. Do not include times when drinking alcohol, using recreational drugs, or taking medications that cause dizziness. In the past 12 months, {have you/has SP} had problems with... vertigo - a sensation of spinning, tilting, swaying or rocking of {yourself/himself/herself/SP's} or {your/his/her/SP's} surroundings?

Source releases: 1
Available cycles: 2021-2023
Dataset: Balance

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 study Variable history CDC source