TABLE 2.

Major components that have been measured in various cycles of the continuous NHANES¹

Component	Household interview	MEC visit	Post-MEC interview
Sociodemographic status	x
Medical history	x
Medication use	x
Nutrition knowledge and behaviors	x		x
Infant feeding practices	x
Eating away from home	x	x
Weight history and weight control practices	x	x
Clinical examination on selected conditions (hypertension, cardiovascular disease, hearing, vision, oral health, taste and smell, etc.)		x
Anthropometric measurements		x
Body composition		x
Biological specimen collection and laboratory testing (nutrient status, hormones, health conditions, chemical exposures, etc.).		x
Physical activity (questionnaire, monitor)		x
24-h dietary recall		x	x
Dietary supplements use	Past 30 d	X (after 24-h dietary recall)	x (after 24-h dietary recall)

¹Empty cells indicate that data on the corresponding component were not collected at that interview or examination. MEC, Mobile Examination Center.