During the government shutdown, only websites supporting excepted functions will be updated. As a result, the information on this website may not be up-to-date and the agency may not be able to respond to inquiries. Updates regarding government operating status and resumption of normal operations can be found at https://www.opm.gov/.
Questionnaires are administered to NHANES participants both at home and in the mobile examination centers (MECs). The questionnaires and a brief description of each section follows.