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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 results1,286unique 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.

ACD040Indexed NHANES variable

Questionnaire

Now I'm going to ask you about language use. What language(s) {do you/does SP} usually speak at home? {Do you/Does he/Does she} speak only Spanish, more Spanish than English, both equally, more English than Spanish, or only English?

Source releases
1
Available cycles
2021-2023
Dataset
Acculturation
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
ALQ111Indexed NHANES variable

Questionnaire

In your entire life, have you had at least 1 drink of any kind of alcohol, not counting small tastes or sips? By a drink, I mean a 12 oz. beer, a 5 oz. glass of wine, or one and a half ounces of liquor.

Source releases
1
Available cycles
2021-2023
Dataset
Alcohol Use
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
ALQ121Indexed NHANES variable

Questionnaire

During the past 12 months, about how often did you drink any type of alcoholic beverage? PROBE: In other words, how many days per week, per month, or per year did you drink?

Source releases
1
Available cycles
2021-2023
Dataset
Alcohol Use
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
ALQ130Indexed NHANES variable

Questionnaire

During the past 12 months, on those days that you drank alcoholic beverages, on average, how many drinks did you have? (By a drink, I mean a 12 oz. beer, a 5 oz. glass of wine, or one and a half ounces of liquor.)

Source releases
1
Available cycles
2021-2023
Dataset
Alcohol Use
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
ALQ142Indexed NHANES variable

Questionnaire

During the past 12 months, about how often did you have {DISPLAY NUMBER} or more drinks of any alcoholic beverage? PROBE: In other words, how many days per week, per month, or per year did you have {DISPLAY NUMBER} or more drinks in a single day?

Source releases
1
Available cycles
2021-2023
Dataset
Alcohol Use
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
AUQ054Indexed NHANES variable

Questionnaire

These next questions are about {your/SP's} hearing. Which statement best describes {your/SP's} hearing (without a hearing aid, personal sound amplifier, or other listening devices)? Would you say {your/his/her} hearing is excellent, good, that {you have/s/he has} a little trouble, moderate trouble, a lot of trouble, or {are you/is s/he} deaf?

Source releases
1
Available cycles
2021-2023
Dataset
Audiometry
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
AUQ101Indexed NHANES variable

Questionnaire

How often {do you/does SP} have difficulty hearing and understanding if there is background noise, for example, when other people are talking, TV or radio is on, or children are playing? Would you say...

Source releases
1
Available cycles
2021-2023
Dataset
Audiometry
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
AUQ144Indexed NHANES variable

Questionnaire

A hearing test by a specialist is one that is done in a sound proof booth or room, or with headphones. Hearing specialists include audiologists, ear nose and throat doctors, and trained technicians or occupational nurses. When was the last time {you /SP} had {your/his/her} hearing tested by a hearing specialist?

Source releases
1
Available cycles
2021-2023
Dataset
Audiometry
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
BAQ321AIndexed NHANES variable

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
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
BAQ321BIndexed NHANES variable

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... blurring of {your/his/her/SP's} vision when {you move your/he moves his/she moves her/SP moves SP's} head?

Source releases
1
Available cycles
2021-2023
Dataset
Balance
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
BAQ321CIndexed NHANES variable

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... unsteadiness - a feeling of being off-balance or not stable when standing or sitting upright?

Source releases
1
Available cycles
2021-2023
Dataset
Balance
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
BAQ321DIndexed NHANES variable

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... light-headedness - without a sense of motion, OR fainting - a feeling {you are/he is/she is/SP is} going to pass out or faint

Source releases
1
Available cycles
2021-2023
Dataset
Balance
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
BAQ401Indexed NHANES variable

Questionnaire

During the past 12 months, {did your/SP's} dizziness or balance problem(s) prevent {you/SP} from doing things {you/he/she/SP} otherwise would do, such as, work, school, or other scheduled activities?

Source releases
1
Available cycles
2021-2023
Dataset
Balance
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
BAQ431Indexed NHANES variable

Questionnaire

Think of any time {you have/SP has} had symptoms of dizziness, imbalance, etc. {Have you/Has SP} ever seen a doctor or other health professional, including emergency room physicians, about {your/his/her/SP's} problem(s) with balance, blurred vision, or light-headedness and fainting?

Source releases
1
Available cycles
2021-2023
Dataset
Balance
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
BAQ530Indexed NHANES variable

Questionnaire

The next questions are about frequency of falling and associated injuries. By "falling", we mean unexpectedly or unintentionally dropping to a lower surface - the floor or ground - for example, from a standing, seated, walking, or bending position. During the past 5 years, how many times {have you/has SP} fallen?

Source releases
1
Available cycles
2021-2023
Dataset
Balance
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing