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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.

Filtered NHANES results3,908unique 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.

AGQ160Indexed NHANES variable

Questionnaire

Has this itchy rash at any time affected any of the following places: the folds of the elbows, behind the knees, in front of the ankles, under the buttocks, or around the neck, ears, or eyes?

Source releases
1
Available cycles
2005-2006
Dataset
Allergy
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
ALQ010Indexed NHANES variable

Questionnaire

English Text: The following questions ask about alcohol use. This includes beer, wine, wine coolers, and liquor such as rum, gin, vodka, or whiskey. This does not include drinking a few sips of wine for religious purposes. How old were you when you had your first drink of alcohol, other than a few sips?

Source releases
1
Available cycles
2005-2006
Dataset
Alcohol Use - Youth
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
ALQ101Indexed NHANES variable

Questionnaire

The next questions are about drinking alcoholic beverages. Included are liquor (such as whiskey or gin), beer, wine, wine coolers, and any other type of alcoholic beverage.In any one year, {have you/has SP} had at least 12 drinks of any type of alcoholic beverage? By a drink, I mean a 12 oz. beer, a 5 oz. glass of wine, or one and half ounces of liquor.

Source releases
1
Available cycles
2005-2006
Dataset
Alcohol Use
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
ALQ140QIndexed NHANES variable

Questionnaire

In the past 12 months, on how many days did {you/SP} have 5 or more drinks of any alcoholic beverage? PROBE: How many days per week, per month, or per year did {you/SP} have 5 or more drinks in a single day?

Source releases
1
Available cycles
2005-2006
Dataset
Alcohol Use
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing