TABLE 1.

Participant Characteristics (N = 506)

Characteristics	Variable	Category	All	%	Girls	%	Boys	%	χ2 P
			n		n		n
Individual characteristics	Language of interview	English	300	0.59	248	0.61	52	0.51	.07
		Spanish or Spanish and English	206	0.41	157	0.39	49	0.49
	Child’s race and/or ethnicity	African American	135	0.27	111	0.27	24	0.24	.69
		Hispanic	307	0.61	242	0.6	65	0.64
		Hispanic African American	64	0.13	52	0.13	12	0.12
	Age at baseline questionnaire (in y)	6–6.99	189	0.37	151	0.37	38	0.38	.92
		7–7.99	159	0.31	126	0.31	33	0.33
		8–8.99	158	0.31	128	0.32	30	0.3
	Caregiver’s education	≤ HS diploma	303	0.61	235	0.59	68	0.69	.06
		≥ Some college	192	0.39	162	0.41	30	0.31
Neighborhood characteristics: housing	Public or private housing	Privately owned housing	294	0.61	238	0.62	56	0.58	.53
		Public housing	187	0.39	147	0.38	40	0.42
	No. HH smokers	0 HH smokers	328	0.65	258	0.64	70	0.69	.11
		1 HH smokers	124	0.25	98	0.24	26	0.26
		2+ HH smokers	54	0.11	49	0.12	5	0.05
Neighborhood characteristics: school	Type of school child attends	Charter school	23	0.05	22	0.05	1	0.01	.07
		Private school	33	0.07	29	0.07	4	0.04
		Public school	450	0.89	354	0.87	96	0.95
	Y of urine sample collection	2004	20	0.04	20	0.05	0	0	<.001
		2005	153	0.3	117	0.29	36	0.36
		2006	230	0.45	169	0.42	61	0.6
		2007	103	0.2	99	0.24	4	0.04
	In school yesterday	In school yesterday	277	0.55	222	0.55	55	0.54	.89
		Not in school yesterday	226	0.45	180	0.45	46	0.46
Indoor time	≥ 3 h/wk in outside play	< 3 h outside in play per wk	258	0.51	213	0.53	45	0.45	.14
		≥ 3 h outside in play per wk	248	0.49	192	0.47	56	0.55
	≥8.5 (median) of sedentary activity per d	< 8.5 h of sedentary activity per wk	242	0.48	190	0.47	52	0.51	.41
		≥ 8.5 h of sedentary activity per wk	264	0.52	215	0.53	49	0.49
	D of week yesterday	Weekday yesterday	423	0.84	341	0.84	82	0.81	.47
		Weekend yesterday	83	0.16	64	0.16	19	0.19
	Season of urine collection	Fall and winter: September to February	250	0.49	203	0.5	47	0.47	.96
		Spring: March to June	185	0.37	145	0.36	40	0.4
		Summer: July to August	71	0.14	57	0.14	14	0.14
Total			—	—	405	—	101	—	—

HH, household; HS, high school; —, not applicable.