Table 2.

Diagnosis, sociodemographic, and trauma characteristics of selected high and low comorbidity classes¹

	Substance use with high comorbidity (personality/stress/psychosis) (N = 6,298)		Substance use only (N = 31,610)		Depression with high comorbidity (stress/substance/personality/neurotic) (N = 6,304)		Depression only (N = 22,597)		Broad high comorbidity (N = 1,279)		Stress only (N = 23,226)

	N	%	N	%	N	%	N	%	N	%	N	%

Sociodemographic
Median Age² (Q1, Q3)	30.2 (20.8, 41.7)		46.2 (31.7, 58.3)		38.8 (26.3, 51.0)		51.6 (30.5, 71.7)		17.0 (14.6, 22.0)		29.7 (20.0, 43.3)
Gender (female)	2,982	47	10,640	34	3,979	63	15,591	69	888	69	15,776	68
Income quartile
<Q1	2,375	38	7,177	23	1,687	27	5,171	23	715	56	7,124	31
Q1–Q2	2,111	34	13,407	42	2,083	33	8,110	36	154	12	5,494	24
Q2–Q3	1,091	17	6,210	20	1,450	23	5,260	23	56	4.4	4,902	21
Q3<=	400	6.4	3,930	12	907	14	3,570	16	28	2.2	3,385	15
Child	121	1.9	410	1.3	58	0.92	237	1.0	224	18	1530	6.6
Missing	200	3.2	476	1.5	119	1.9	249	1.1	102	8.0	791	3.4
Marital Status
Married/partnership	878	14	7,613	24	1,919	30	8,443	37	58	4.5	6,979	30
Single	4,332	69	14,149	45	2,879	46	7,263	32	1,195	93	12,902	56
Divorced	986	16	7,898	25	1,199	19	3,194	14	20	1.6	2,444	11
Widowed	85	1.3	1,839	5.8	292	4.6	3,649	16	<5	--	757	3.3
Unknown	17	0.27	111	0.35	15	0.24	48	0.21	<10	--	144	0.62

Abbreviations: Q=quartile.

In order to evaluate the distribution of covariates across classes, individuals were assigned to the single class with the highest predicted likelihood of membership. Class sizes reported here are based on most-likely class membership. These values are slightly different than the model-based class size estimates reported in text because model-based estimates account for uncertainty in class membership (i.e., an individual can be a partial member of multiple classes).

Median age is reported rather than mean age because age did not have a normal distribution