Table 1.

Demographic characteristics of the participants.

		n	%	Weighted %	95%CI
Total		13,677	100	/	/	/
Sex
	Female	6,885	50.3	49.4	47.9	50.9
	Male	6,641	48.6	50.6	49.1	52.1
	Missing	151	1.1
Age group
	≤ 12 years	60	0.4	0.3	0.2	0.5
	13 years	27	0.2	0.1	0.0	0.2
	14 years	1,699	12.4	11.9	10.9	13.0
	15 years	3,473	25.4	24.8	23.5	26.0
	16 years	3,628	26.5	25.6	24.5	26.7
	17 years	3,102	22.7	23.7	22.5	24.8
	≥18 years	1,616	11.8	13.7	12.6	14.9
	Missing	72	0.5
Grade
	9th	3,637	26.6	26.6	25.4	28.0
	10th	3,717	27.2	25.5	24.7	26.3
	11th	3,322	24.3	24.3	23.2	25.4
	12th	2,850	20.8	23.6	22.4	24.8
	Missing	151.0	1.1
Ethnic group
	White	6,668	48.8	51.2	46.4	56.0
	African American	2,040	14.9	12.2	10.2	14.6
	Hispanic/Latino	3,038	22.2	26.1	21.8	30.9
	All other ethnic groups	1,493	10.9	10.5	7.9	13.9
	Missing	438	3.2
Overweight
	Yes	1,933	14.1	16.10	14.90	17.50
	No	10,207	74.6	83.90	82.50	85.10
	Missing	1,537	11.2
Obesity
	Yes	1,795	13.1	15.50	13.80	17.30
	No	10,345	75.6	84.50	82.70	86.20
	Missing	1,537	11.2

CI, confidence interval.