Table 1.

Demographic Characteristics ( N = 2008)

	Exposure status
	Unexposed	Secondhand smoke exposed	Smokers	P	Adjusted P value a
Age (mean ± SD )	14.9±2.2	15.5±2.3	17.5±1.5	<.001	.49
Male, %	48.9	52.7	65.4	<.001	.99
Non-Hispanic white, %	25.7	26.2	44.0	<.001	.76
BMI, percentile b				<.001	.32
85th–94th	17.4	16.9	17.3
≥95th	16.3	25.2	19.8
Elevated BP, % c				<.001	.97
Pre-hypertensive	11.8	15.7	22.9
Hypertensive	1.9	2.7	2.0
Diabetes, %	1.36	1.24	3.46	.02	.77
RISCC score d	18.6±6.9	18.8±7.1	18.2±7.0	.55	.35
Cotinine, ng/ml (median, IQR)	0.02 (0.01–0.03)	0.26 (0.09–0.94)	82.3 (19.9–174)	<.001	— e

BMI = body mass index; BP = blood pressure; IQR = interquartile range; RISCC = ratio of ingested saturated fat and cholesterol to calories.

^a Adjusted with the use of multiple propensity scores.

^b BMI percentiles shown are calculated as BMI-for-age percentiles from the 2000 CDC growth charts.

^c Elevated blood pressure follows definitions from the Fourth Report on the Diagnosis, Evaluation, and Treatment of High Blood Pressure in Children and Adolescents.

^d The RISCC is a single score that conveys the potential effect of diet on lipoproteins; it is calculated as: {(1.01 × saturated fat [in grams]) + (0.05 × cholesterol [in milligrams])} / (kcal/1000).

^e Cotinine is not included in the propensity score estimation since it is used to define exposure status.