Table 2.

Item-response probabilities for the adjusted LCA with covariates model

		Class 1		Class 2		Class 3		Class 4		Class 5
		Non-users		Past primarily marijuana		Past multi drug		High consequence, multi drug		Low consequence, primarily marijuana
		HIV−	HIV+	HIV−	HIV+	HIV−	HIV+	HIV−	HIV+	HIV−	HIV+
Class Prevalence (%)		36.4	19.6	14.5	15.8	19.1	20.1	18.0	25.5	12.0	19.0
Problematic drug use	never use	0.99	1	0	0	0	0	0	0	0	0
	past use(no/problems)	0	0	0.98	0.97	0.94	0.94	0	0	0	0
	past year use, no problems	0	0	0	0	0	0	0.26	0.36	0.88	0.93
	past year use, problems	0.006	0	0.02	0.03	0.06	0.06	0.74	0.64	0.12	0.06
Cocaine/stimulant use	never	1	1	0.81	0.57	0.06	0.02	0.04	0.03	0.47	0.35
	not past year	0	0	0.19	0.43	0.94	0.98	0.18	0.16	0.32	0.43
	some past year	0	0	0	0	0	0	0.40	0.45	0.19	0.20
	heavy past year	0	0	0	0	0	0	0.38	0.35	0.02	0.01
Heroin/opiate use	never	1	1	0.98	0.96	0.24	0.11	0.38	0.41	0.68	0.72
	not past year	0	0	0.01	0.04	0.76	0.89	0.24	0.23	0.16	0.21
	any past year	0	0	0	0	0	0	0.37	0.35	0.15	0.06
Marijuana use	never	1	1	0	0.03	0.08	0.04	0.10	0.09	0.09	0.03
	not past year	0	0	1	0.97	0.92	0.96	0.44	0.43	0.09	0.04
	some past year	0	0	0	0	0	0	0.31	0.32	0.49	0.53
	heavy past year	0	0	0	0	0	0	0.14	0.16	0.33	0.40