Table 3.

Summary of logistic regression analysis with drinking severity group as a predictor of past-6-month heroin and cocaine use by route of administration.

	Injection		Snorting		Smoking		Swallowing
Predictor	AOR^a	(95% CI)	AOR^a	(95% CI)	AOR^a	(95% CI)	AOR^a	(95% CI)
Predictors of heroin use
Abstainers vs. moderate users	0.68	0.43–1.08	1.66^*	1.11–2.47	—	—	1.25	0.41–3.88
Abstainers vs. problematic users	0.35^***	0.21–0.60	1.52	0.95–2.44	5.60	0.34–92.04	3.14	0.84–11.74
Moderate vs. problematic users	0.47^**	0.29–0.84	0.95	0.60–1.52	—	—	2.53	0.68–9.41
Predictors of cocaine use
Abstainers vs. moderate users	1.01	0.66–1.52	1.72^*	1.04–2.85	—	—	0.60	0.09–4.18
Abstainers vs. problematic users	0.52^*	0.31–0.89	3.94^***	2.29–6.80	—	—	2.32	0.44–12.36
Moderate vs. problematic users	0.53^*	0.32–0.90	2.32^**	1.41–3.81	—	—	3.92	0.41–37.72
Predictors of speedball use
Abstainers vs. moderate users	1.01	0.72–1.62	1.45	0.74–2.81	—	—	—	—
Abstainers vs. problematic users	0.61	0.36–1.01	2.14^*	1.06–4.34	—	—	—	—
Moderate vs. problematic users	0.55^*	0.33–0.93	1.57	0.83–2.97	—	—	—	—
Predictors of crack use
Abstainers vs. moderate users	1.05	0.17–6.56	—	—	1.93^***	1.29–2.89	—	—
Abstainers vs. problematic users	0.97	0.10–9.83	—	—	2.88^***	1.75–4.77	—	—
Moderate vs. problematic users	0.68	0.07–6.58	—	—	1.55	0.94–2.56	—	—

Adjusted odds ratio, adjusted for age and sex. Drinking severity group was created using prior-30-day alcohol use.

P < .05;

^**

P < .01;

^***

P < .001.