National Health and Nutrition Examination Survey (NHANES) Restricted Variables
All geography below the national level is restricted for continuous NHANES, prior to that all geography below the regional level is restricted.
The exact date of interview and exam are restricted for all years
The genetic data collected by NHANES is largely restricted.
Please read through the documentation for the dataset you are using thoroughly. Think about your analysis before submitting your proposal. From time to time information that will aide you in your analysis, for example the structure of genetic data, or the pending release of new data, will only be found in our communication with you. Once this information is provided, you and your research team must decide how to sue this information if at all. It is the RDCs policy not to comment on the scientific merit or analytical methods or projects. Please direct your questions about genetic data to, NHANESGenetics@CDC.gov, and about the RDC process to RDCA@cdc.gov.
Limited Access Data from Continuous NHANES
Linked Data Products
NHANES has been linked to Mortality, Medicare Claims, Social Security Benefits, and Air Quality data.
Quarterly Food-at-Home Price Database
NCHS has conducted a data linkage of the National Health and Nutrition Examination Survey (NHANES) to the Quarterly Food-at-Home Price Database (QFAHPD) from USDA’s Economic Research Service (ERS). The NHANES Linked food price data files include the continuous NHANES years (1999-2006). Linkage of the NHANES survey participants with the QFAHPD provides the opportunity to support research on the economic determinants of food consumption, diet quality, and health outcomes. These data files contain geography-specific information, therefore, are not available for public-use. They can be accessed through the NCHS Research Data Center (RDC).