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 results179unique 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

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.

DMDCITZNIndexed NHANES variable

Demographics

{Are you/Is SP} a citizen of the United States? [Information about citizenship is being collected by the U.S. Public Health Service to perform health related research. Providing this information is voluntary and is collected under the authority of the Public Health Service Act. There will be no effect on pending immigration or citizenship petitions.]

Source releases
10
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
DMDEDUC2Indexed NHANES variable

Demographics

(SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received?

Source releases
12
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
DMDEDUC3Indexed NHANES variable

Demographics

(SP Interview Version) What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received?

Source releases
10
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
DMDHHSIZIndexed NHANES variable

Demographics

Total number of people in the Household

Source releases
11
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2021-2023
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
DMDHRAGEIndexed NHANES variable

Demographics

Age in years of the household reference person at the time of HH screening. Individuals 85 and over are topcoded at 85 years of age.

Source releases
9
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
DMDHREDUIndexed NHANES variable

Demographics

What is the highest grade or level of school {you have/NON_SP HEAD has} received?

Source releases
9
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
DMDHRGNDIndexed NHANES variable

Demographics

Gender of the household reference person

Source releases
11
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2021-2023
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
DMDHRMARIndexed NHANES variable

Demographics

Marital Status of household reference person

Source releases
9
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
DMDHSEDUIndexed NHANES variable

Demographics

What is the highest grade or level of school {you have/NON-SP SPOUSE has completed or the highest degree {you have/he/she has} received

Source releases
9
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
DMDMARTLIndexed NHANES variable

Demographics

Marital Status

Source releases
10
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
DMDYRSUSIndexed NHANES variable

Demographics

Length of time SP has been in the US.

Source releases
10
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
DMQADFCIndexed NHANES variable

Demographics

Did {you/SP} ever serve in a foreign country during a time of armed conflict or on a humanitarian or peace-keeping mission? (This would include National Guard or reserve or active duty monitoring or conducting peace keeping operations in Bosnia and Kosovo, in the Sinai between Egypt and Israel, or in response to the 2004 tsunami or Haiti in 2010.)

Source releases
4
Available cycles
2011-2012 · 2013-2014 · 2015-2016 · 2017-2018
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
DMQMILIZIndexed NHANES variable

Demographics

{Have you/Has SP} ever served on active duty in the U.S. Armed Forces, military Reserves, or National Guard? (Active duty does not include training for the Reserves or National Guard, but does include activation, for service in the U.S. or in a foreign country, in support of military or humanitarian operations.)

Source releases
5
Available cycles
2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2021-2023
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
FIAINTRPIndexed NHANES variable

Demographics

Was an interpreter used to conduct the Family interview?

Source releases
9
Available cycles
2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
FIALANGIndexed NHANES variable

Demographics

Language of the Family Interview Instrument

Source releases
9
Available cycles
2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
FIAPROXYIndexed NHANES variable

Demographics

Was a Proxy respondent used in conducting the Family Interview?

Source releases
9
Available cycles
2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
INDFMPIRIndexed NHANES variable

Demographics

Poverty income ratio (PIR) - a ratio of family income to poverty threshold

Source releases
12
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
MIAINTRPIndexed NHANES variable

Demographics

Was an interpreter used to conduct the MEC CAPI interview?

Source releases
9
Available cycles
2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
MIALANGIndexed NHANES variable

Demographics

Language of the CAPI MEC Interview Instrument

Source releases
9
Available cycles
2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
MIAPROXYIndexed NHANES variable

Demographics

Was a Proxy respondent used in conducting the MEC CAPI Interview?

Source releases
9
Available cycles
2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
RIAGENDRIndexed NHANES variable

Demographics

Gender of the sample person

Source releases
12
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
RIDAGEMNIndexed NHANES variable

Demographics

Best age in months at date of screening for individuals under 85 years of age.

Source releases
12
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
RIDAGEYRIndexed NHANES variable

Demographics

Best age in years of the sample person at time of HH screening. Individuals 85 and over are topcoded at 85 years of age.

Source releases
12
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
RIDEXMONIndexed NHANES variable

Demographics

Six month time period when the examination was performed - two categories: November 1 through April 30, May 1 through October 31.

Source releases
12
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
RIDEXPRGIndexed NHANES variable

Demographics

Pregnancy status at the time of MEC exam.

Source releases
12
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
RIDPREGIndexed NHANES variable

Demographics

Pregnancy status variable based on all source data. NOTE: This is the previous pregnancy status recode variable. RIDPREG is a more conservative pregnancy status variable. Please review the file documentation.

Source releases
2
Available cycles
1999-2000 · 2001-2002
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
RIDRETH1Indexed NHANES variable

Demographics

Recode of reported race and ethnicity information.

Source releases
12
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
RIDSTATRIndexed NHANES variable

Demographics

Interview and Examination Status of the Sample Person.

Source releases
12
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
SDDSRVYRIndexed NHANES variable

Demographics

Data Release Number.

Source releases
12
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
SDMVPSUIndexed NHANES variable

Demographics

Masked Variance Unit Pseudo-PSU variable for variance estimation

Source releases
12
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
SDMVSTRAIndexed NHANES variable

Demographics

Masked Variance Unit Pseudo-Stratum variable for variance estimation

Source releases
12
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
SEQNIndexed NHANES variable

Demographics

Respondent sequence number.

Source releases
12
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
SIAINTRPIndexed NHANES variable

Demographics

Was an interpreter used to conduct the Sample Person (SP) interview?

Source releases
9
Available cycles
2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
SIALANGIndexed NHANES variable

Demographics

Language of the Sample Person Interview Instrument

Source releases
9
Available cycles
2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
SIAPROXYIndexed NHANES variable

Demographics

Was a Proxy respondent used in conducting the Sample Person (SP) interview?

Source releases
9
Available cycles
2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases
WTINT2YRIndexed NHANES variable

Demographics

Interviewed Sample Persons.

Source releases
11
Available cycles
1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2021-2023
Dataset
Demographic Variables & Sample Weights
CDC/NCHS source releases