Table 3.

Treatment Effect Estimates from Random Effects Negative Binomial Regression Models of UAIMP at both 3-months and 12-months on Treatment Indicator among Full Sample and among Users who Reported Risk at Baseline

	N	Incident Rate Ratio (IRR)	Lower 95% CI	Upper 95% CI	P-value
3 month outcome
Full Sample
Unadjusted	650	0.832	0.691	1.000	0.050
Adjusted*	650	0.844	0.704	1.013	0.068
Non-zero Risk at Baseline**
Unadjusted	584	0.825	0.684	0.995	0.044
Adjusted*	584	0.843	0.701	1.014	0.069
12 month outcome
Full Sample
Unadjusted	650	0.998	0.952	1.046	0.921
Adjusted*	650	0.998	0.952	1.046	0.937
Non-zero Risk at Baseline**
Unadjusted	584	0.991	0.945	1.040	0.728
Adjusted*	584	0.993	0.947	1.042	0.786

^*Adjusted for continuous age, categorical race as presented in Table 1, and categorical income group as presented in Table 1

^**66 users reported having no risk (0 UAI partners) at baseline; these users are excluded from following analyses