Data intelligence · automation · analyticsA Praxis Global Institute platform
PraxisData Lab

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 results3,556unique 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
2017-2020
Dataset
Acculturation
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
ALD040Indexed NHANES variable

Questionnaire

During the past 30 days, on how many days did you have {'4' Female, '5' Male - DISPLAY NUMBER} or more drinks of alcohol in a row, that is, within a couple of hours?

Source releases
1
Available cycles
2017-2020
Dataset
Alcohol Use - Youth
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
ALQ111Indexed 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 {your/SP's} entire life, {have you/has he/has she} 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
2017-2020
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/SP} drank alcoholic beverages, on the average, how many drinks did {you/he/she} 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
2017-2020
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/SP} have {DISPLAY NUMBER} or more drinks of any alcoholic beverage? PROBE: How many days per week, per month, or per year did {you/SP} have {DISPLAY NUMBER} or more drinks in a single day?

Source releases
1
Available cycles
2017-2020
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
2017-2020
Dataset
Audiometry
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
AUQ060Indexed NHANES variable

Questionnaire

These next questions refer to hearing without the use of a hearing aid or any other listening devices. If {you have/SP has} one ear that is better than the other, please answer the questions for the hearing in {your/SP's} better ear. Can {you/SP} usually hear and understand what a person says without seeing his or her face if that person whispers to {you/him/her} from across a quiet room?

Source releases
1
Available cycles
2017-2020
Dataset
Audiometry
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
AUQ070Indexed NHANES variable

Questionnaire

Can {you/SP} usually hear and understand what a person says without seeing his or her face if that person talks in a normal voice to {you/him/her} from across a quiet room?

Source releases
1
Available cycles
2017-2020
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
2017-2020
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
2017-2020
Dataset
Audiometry
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
AUQ153Indexed NHANES variable

Questionnaire

In the past 2 weeks, how often {have you/has SP} worn a {hearing aid and/or personal sound amplifier and/or cochlear implant}? If unsure, provide your best estimate of the average amount of time {you have/he has/she has} worn {your/his/her} {hearing aid, and/or personal sound amplifier, and/or cochlear implant}.

Source releases
1
Available cycles
2017-2020
Dataset
Audiometry
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
AUQ156Indexed NHANES variable

Questionnaire

Because of hearing loss, {have you/has SP} ever used any of the following to improve {your/his/her} communication: FM systems, closed-captioned television, instant or text messages, live video streaming, amplified telephone, relay services, or a sign-language interpreter?

Source releases
1
Available cycles
2017-2020
Dataset
Audiometry
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
AUQ300Indexed NHANES variable

Questionnaire

This next question is about {your/SP's} use of firearms that {you/he/she} may have used for target shooting, hunting, for {your/his/her} job or in military service. {Have you/Has SP} ever used firearms for any reason?

Source releases
1
Available cycles
2017-2020
Dataset
Audiometry
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
AUQ330Indexed NHANES variable

Questionnaire

These next questions are about noise exposure {you/SP} may have had at work. {Have you/Has SP} ever had a job, or combination of jobs where {you were/s/he was} exposed to loud sounds or noise for 4 or more hours a day, several days a week? (Loud means so loud that {you/s/he} must speak in a raised voice to be heard.)

Source releases
1
Available cycles
2017-2020
Dataset
Audiometry
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
AUQ350Indexed NHANES variable

Questionnaire

In {your/SP's} work {were you/was he/was she} exposed to very loud noise? (Very loud noise is noise that is so loud {you have/he has/she has} to shout in order to be understood by someone standing 3 feet away from {you/him/her}.)

Source releases
1
Available cycles
2017-2020
Dataset
Audiometry
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
AUQ360Indexed NHANES variable

Questionnaire

This next question is about {your/SP's} work in jobs where there was very loud noise for 4 or more hours a day, several days a week. Please give me the total number of months or years for all jobs where this has happened.

Source releases
1
Available cycles
2017-2020
Dataset
Audiometry
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing
AUQ370Indexed NHANES variable

Questionnaire

Outside of a job, {have you/has SP} ever been exposed to very loud noise or music for 10 or more hours a week? This is noise so loud that {you have/s/he has} to shout to be understood or heard 3 feet away. Examples are noise from power tools, lawn mowers, farm machinery, cars, trucks, motorcycles, motor boats or loud music.

Source releases
1
Available cycles
2017-2020
Dataset
Audiometry
CDC/NCHS source releases
Add to Study BuilderVariable historyCDC source listing