Praxis Data Lab · NHANES Explorer
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.
Filter applied to the public catalogue. Open a result to inspect its cycle availability and CDC/NCHS source evidence.
View variable history reportFree public variable catalogue
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.
Counts show unique variable codes available within each filter. A variable may appear in more than one component or cycle.
Automated CDC/NCHS catalog
Add any indexed variable to Study Builder. Praxis evaluates the selected cycles and returns the available harmonization intelligence, source history, and method context.
Demographics