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Praxis Data Lab · NHANES Explorer

Explore NHANES variables.

Use the Explorer’s free public catalogue to find variables by code, health concept, survey component, cycle, dataset name, or file code. Inspect source availability and add variables directly to Study Builder.

Results for “AUQ340”1unique matching variables

Filter applied to the public catalogue. Open a result to inspect its cycle availability and CDC/NCHS source evidence.

View variable history report

Free public variable catalogue

Start with the question you want to answer.

Browse the complete indexed variable inventory by survey component or cycle, then refine it with the search tools below. Catalogue discovery is open to everyone.

Searchable inventory13,311unique NHANES variable codes

Browse by survey component

5 indexed components
Demographics179variablesDietary1,184variablesExamination4,954variablesLaboratory3,394variablesQuestionnaire3,649variables

Browse by cycle

13 indexed cycles
1999-20004,3952001-20024,1102003-20044,8442005-20063,9082007-20083,8372009-20104,1312011-20124,2622013-20144,4372015-20164,2342017-20184,1362017-20203,5562021-20231,2862025-20260

Counts show unique variable codes available within each filter. A variable may appear in more than one component or cycle.

Automated CDC/NCHS catalog

Continuous NHANES variable results

Add any indexed variable to Study Builder. Praxis evaluates the selected cycles and returns the available harmonization intelligence, source history, and method context.