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.

Free public accessSearch, browse, and build

Discover variables without an account, then carry your selections into Study Builder.

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

Demographics179variables Dietary1,184variables Examination4,954variables Laboratory3,394variables Questionnaire3,649variables

Browse by cycle

13 indexed cycles

1999-20004,395 2001-20024,110 2003-20044,844 2005-20063,908 2007-20083,837 2009-20104,131 2011-20124,262 2013-20144,437 2015-20164,234 2017-20184,136 2017-20203,556 2021-20231,286 2025-20260

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.

AADBDSPIndexed NHANES variable

Laboratory

Bed Space Vacuumed (square inches)

Source releases: 1
Available cycles: 2005-2006
Dataset: Allergens - Household Dust

CDC/NCHS source releases

Explore NHANES variables.

Start with the question you want to answer.

Browse by survey component

Browse by cycle

Continuous NHANES variable results

Bed Space Vacuumed (square inches)

Bed Vacuum Time (seconds)

Type of Bed

Status of Dust Allergen Data

Floor Space Vacuumed (square inches)

Floor Vacuum Time (seconds)

Have you/any of the SPs listed below moved since the time when you were last interviewed in your household?

Impermeable Mattress Cover

Impermeable Pillow Cover

Bed Sample Status

Bed Surface Vacuumed

Floor Sample Status

Type of Floor Covering

Room Description

Room Humidity (%)

Room Temperature (F)

What language(s) {do you/does SP} usually speak at home?

What language(s) {do you/does SP} usually speak at home?

What language(s) {do you/does SP} usually speak at home?

What language(s) {do you/does SP} usually speak at home?

What language(s) {do you/does SP} usually speak at home?

What language(s) {do you/does SP} usually speak at home?

What language(s) {do you/does SP} usually speak at home? Would you say...

In what country was {your/SP's} father born?

In what country was {your/SP's} mother born?

Continuous NHANES variable results

Bed Space Vacuumed (square inches)

Bed Vacuum Time (seconds)

Type of Bed

Status of Dust Allergen Data

Floor Space Vacuumed (square inches)

Floor Vacuum Time (seconds)

Have you/any of the SPs listed below moved since the time when you were last interviewed in your household?

Impermeable Mattress Cover

Impermeable Pillow Cover

Bed Sample Status

Bed Surface Vacuumed

Floor Sample Status

Type of Floor Covering

Room Description

Room Humidity (%)

Room Temperature (F)

What language(s) {do you/does SP} usually speak at home?

What language(s) {do you/does SP} usually speak at home?

What language(s) {do you/does SP} usually speak at home?

What language(s) {do you/does SP} usually speak at home?

What language(s) {do you/does SP} usually speak at home?

What language(s) {do you/does SP} usually speak at home?

What language(s) {do you/does SP} usually speak at home? Would you say...

In what country was {your/SP's} father born?

In what country was {your/SP's} mother born?