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.

Results for “RIAGENDR”1unique 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

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.

RIAGENDRIndexed NHANES variable

Demographics

Gender of the sample person

Source releases: 39
Available cycles: 1999-2000 · 2001-2002 · 2001-2002 · 2001-2002 · 2001-2002 · 2003-2004 · 2005-2006 · 2005-2006 · 2005-2006 · 2005-2006 · 2005-2006 · 2007-2008 · 2007-2008 · 2007-2008 · 2007-2008 · 2007-2008 · 2009-2010 · 2009-2010 · 2009-2010 · 2009-2010 · 2009-2010 · 2011-2012 · 2011-2012 · 2011-2012 · 2011-2012 · 2011-2012 · 2013-2014 · 2013-2014 · 2013-2014 · 2013-2014 · 2013-2014 · 2015-2016 · 2015-2016 · 2015-2016 · 2015-2016 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023
Dataset: Demographic Variables & Sample Weights

CDC/NCHS source releases

Add to Study Builder Variable history CDC source listing