Table 2.

Predicting Trajectory Class Membership Using Gender, Race/Ethnicity, and Age at Baseline (N = 1,822)^a

	% in Each Group				Odds Ratios (95% CI) Predicting Class Membershipb
	No SUD	Class 1	Class 2	Class 3	No SUD vs. All Classes	Class 3 vs. Class 1	Class 3 vs. Class 2	Class 2 vs. Class 1
Overall	19.6	24.5	41.3	14.6
Gender
Female	30.4	8.6	54.7	6.3	Referenceb	Referenceb	Referenceb	Referenceb
Male	18.7	25.8	40.3	15.2	0.5 (0.4–0.7)	1.1 (0.4–3.3)	3.6 (2.0–6.7)	0.3 (0.1–1.1)
Race/Ethnicity
African American	20.6	25.5	44.8	9.1	Referencec	Referencec	Referencec	Referencec
Hispanic	17.2	22.1	29.8	30.9	0.8 (0.5–1.2)	2.5 (0.9–6.5)	3.8 (1.6–9.2)	0.6 (0.2–1.9)
Non-Hispanic white	11.7	18.4	26.3	43.5	0.5 (0.3–0.8)	4.7 (1.8–12.2)	6.0 (2.9–12.4)	0.8 (0.3–2.0)
Age at Baselined					1.0 (0.9–1.2)	2.1 (1.4–3.3)	1.0 (0.6–1.5)	2.2 (1.1–4.2)
10–13 years	31.0	53.6	11.9	3.6
14–16 years	14.2	34.3	38.5	13.0
17+ years	22.3	10.6	49.2	17.9

Note: Odds ratios in boldface type are significantly different from 1.0 with P < .05. SUD = substance use disorder.

^aPrevalence estimates and odds ratios are weighted to adjust for sampling design and to reflect the demographic characteristics of the Cook County Juvenile Temporary Detention Center. Four participants who identified as "other" race/ethnicity and 3 participants who never completed the Diagnostic Interview Schedule for Children (DISC) (baseline interview) or the Diagnostic Interview Schedule (DIS) (follow-up interviews) are excluded from the table.

^bOdds ratios comparing Classes 1, 2, and 3 were estimated within our growth mixture model to account for uncertainty in assigning participants to the latent classes. Odds ratios comparing the no-SUD group to all classes were estimated using logistic regression outside the growth mixture model framework.

^cThe reference group is females.

^dThe reference group is African Americans. Odds ratios (95% CI) for Hispanics compared with non-Hispanic whites are as follows: Class 3 vs. Class 1, 1.9 (0.7–5.1); Class 3 vs. Class 2, 1.6 (0.7–3.5); Class 2 vs. Class 1, 1.2 (0.3–4.4); and no SUD vs. all others, 1.6 (0.9–2.6).

^eOdds ratios (95% CI) are given per every year. For example, the odds ratio of 2.1 means that compared with a participant who is 14 years at baseline, a participant who is 15 years has 2.1 times the odds of being in Class 3 compared with Class 1.