Table 1.

Number of variables and files for each NHANES type of dataset or module.

Module	Description	Number of variables	Number of files
Occupation	Industry and occupational title	61	10
Mortality	Cause of death in 2019	11	11
Demographics	Demographic attributes	315	12
Medications	Prescription medications	94	12
Dietary	Nutrient information estimated from the food consumption	649	36
Questionnaire	Self-reported questionnaire items (physical activity, general health status, medical conditions, diabetes)	1267	41
Comments	Indicators of the chemical measurements being above or below the lower limit of detection	469	234
Chemicals	Biomarker results of environmental toxicant exposures	632	237
Weights	Survey weights	252	248
Response	Physical examination and physiological measurements	1045	275