Table 1

Demographic Characteristics of US Adults Aged 18 to 64 Years, NHANES 2009–2012

Characteristic	Unweighted	Weighted
Age, y^a
18–24, No (%)	1,653 (17.4)	14.9
25–30, No (%)	1,136 (11.9)	12.8
31–40, No (%)	1,942 (20.4)	20.4
41–50, No (%)	1,951 (20.5)	22.3
51–64, No (%)	2,846 (29.9)	29.6
Mean (SD), y	40.8 (14.1)	41.1 (11.7)
Race/ethnicity^a
Mexican American, No (%)	1,541 (16.2)	9.2
Other Hispanic, No (%)	1,019 (10.7)	6.2
Non-Hispanic white, No (%)	3,645 (38.3)	64.5
Non-Hispanic black, No (%)	2,201 (23.1)	12.2
Other, No (%)^b	1,122 (11.8)	7.9
Sex^a
Male, No (%)	4,656 (48.9)	49.2
Female, No (%)	4,872 (51.1)	50.8
Income-to-poverty ratio^c
<1 (<100% federal poverty level)	2,308 (26.6)	17.9
Mean (SD) ratio	2.4 (1.7)	2.9 (1.4)

Note: unweighted N = 9,528; weighted n = 193.7 million.
↵a N = 9,528.
↵b Includes Asian, Native American, multiracial, and all other populations.
↵c n = 8,680.