TABLE 1.

Characteristics of survey respondents from National Health and Nutrition Examination Survey (NHANES) I to NHANES 1999– 2002¹

	All (n = 39 094)	NHANES I (n = 10 537)	NHANES II (n = 10 118)	NHANES III (n = 12 042)	NHANES 1999–2002 (n = 6397)
	%
Women	51.4 ± 0.3	53.2 ± 0.5	51.8 ± 0.5	51.1 ± 0.5	50.2 ± 0.7
Race
White	86.6 ± 0.6	89.4 ± 0.7	87.7 ± 1.6	85.0 ± 0.8	85.5 ± 1.3
Black	10.4 ± 0.5	9.7 ± 0.7	10.0 ± 1.2	11.1 ± 0.6	10.5 ± 1.2
Other	2.9 ± 0.3	0.9 ± 0.2	2.2 ± 0.9	3.8 ± 0.4	4.0 ± 0.5
Age group
25–39 y	38.0 ± 0.5	36.0 ± 0.9	39.2 ± 0.8	42.1 ± 1.0	34.7 ± 1.2
40–59 y	42.3 ± 0.4	43.8 ± 0.8	39.7 ± 0.6	38.4 ± 0.7	47.1 ± 0.9
60–74 y	19.7 ± 0.4	20.2 ± 0.7	21.2 ± 0.6	19.5 ± 0.9	18.2 ± 0.7
Education
<12 y	27.2 ± 0.5	38.1 ± 1.1	32.9 ± 1.0	22.8 ± 1.1	20.0 ± 0.8
12 y	32.7 ± 0.5	36.6 ± 0.8	36.3 ± 1.0	34.7 ± 0.8	25.6 ± 1.1
>12 y	40.1 ± 0.7	25.3 ± 1.1	30.8 ± 1.2	42.4 ± 1.2	54.3 ± 1.5
Smoking status
Never smoked	43.4 ± 0.5	40.4 ± 0.8	38.9 ± 0.7	43.4 ± 0.9	48.6 ± 1.3
Former smoker	25.1 ± 0.4	21.0 ± 0.7	24.3 ± 0.5	27.1 ± 0.7	26.3 ± 1.0
Current smoker	31.4 ± 0.4	38.6 ± 0.8	36.7 ± 0.6	29.5 ± 0.9	25.0 ± 0.9
No leisure-time physical activity	33.1 ± 0.6	43.4 ± 1.2	37.5 ± 0.7	21.2 ± 1.0	33.9 ± 1.1
Self-reported chronic disease2	28.2 ± 0.4	23.1 ± 0.5	28.9 ± 0.5	28.6 ± 0.7	30.5 ± 1.1
EI:BEE <1.2	46.1 ± 0.4	51.2 ± 1.0	53.1 ± 0.7	42.0 ± 0.7	41.5 ± 0.8

¹All estimates are ±SE. EI, energy intake; BEE, basal energy expenditure. The chi-square test of independence for each variable in the table was significant, P ≤ 0.002.

²Chronic disease included diabetes, hypertension, and heart disease.