Table 1:

Characteristics of Sample by Presence of Adolescent Health Conditions (N=2,874)

	Full Sample	No chronic health conditions	Any developmental or behavioral or physical health condition(s)	Any developmental or behavioral health condition(s)	Any physical health condition(s)
	N=2,874	N=1,879	N=995	N=661	N=518
Teen characteristics
Male*	.506	0.476	0.563	0.620	0.496
Age, mean in years (s.d.)	15.556 (.74)	15.557 (.75)	15.554 (.73)	15.563 (.74)	15.585 (.74)
Maternal characteristics
Age, mean in years (s.d)	40.729 (6.01)	40.816 (6.06)	40.565 (5.91)	40.487 (5.96)	40.579 (5.87)
Race-ethnicity
Non-Hispanic white*	0.209	0.186	0.252	0.298	0.207
Non-Hispanic black	0.507	0.520	0.482	0.449	0.506
Hispanic	0.248	0.254	0.236	0.222	0.255
Other race-ethnicity	0.036	0.040	0.029	0.030	0.033
Foreign born*	0.141	0.159	0.108	0.094	0.127
Education
< High school graduate	0.178	0.184	0.166	0.145	0.201
High school graduate	0.184	0.181	0.189	0.197	0.180
Some college	0.442	0.438	0.449	0.454	0.442
College graduate	0.197	0.197	0.196	0.204	0.178
Employed*	0.719	0.734	0.690	0.682	0.681
Married*	0.395	0.411	0.364	0.356	0.361
Household characteristics
# children, mean (s.d.)	2.605 (1.51)	2.594 (1.52)	2.626 (1.50)	2.59 (1.49)	2.72 (1.59)
Household income, % of federal poverty line
< 100% *	0.309	0.286	0.354	0.362	0.357
100–199%*	0.283	0.302	0.247	0.248	0.272
> 200%	0.408	0.412	0.399	0.390	0.371

Notes: All figures are proportions unless indicated otherwise. s.d. = standard deviation. All time-varying characteristics were assessed when the child was 15 years old.

^*P <= .05 for difference between teens who had no health conditions and those who had any developmental or physical health condition(s). See Appendix Table 1 for information about coding of specific health conditions.