Table 6.

Six-Month Intervisit Incidence Rate Ratios and Rate Differences for the Effect of the Randomized Intervention on the Rate of Any Drug-Injection–Related Risk Behavior During Follow-up Among Participants With at Least 1 Follow-up Visit, HIV Prevention Trials Network 037 Study, Philadelphia, Pennsylvania, 2002–2006

Intervention	Unadjusted				Baseline-Adjusteda,b
	RR	95% CI	RDc	95% CI	RR	95% CI	RDc	95% CI
Stratified Models
Individuald	0.97	0.64, 1.48	−0.02	−0.15, 0.12	0.92	0.60, 1.40	−0.06	−0.19, 0.07
Disseminatede	0.73	0.55, 0.97	−0.09	−0.17, 0.00	0.71	0.54, 0.93	−0.08	−0.16, −0.01
Compositef	0.71	0.52, 0.97	−0.10	−0.21, 0.00	0.65	0.47, 0.90	−0.14	−0.24, −0.03
Overallg	0.72	0.57, 0.90	−0.09	−0.16, −0.02	0.69	0.56, 0.86	−0.09	−0.16, −0.03
Aggregate Models
Individual	0.96	0.67, 1.39	−0.02	−0.14, 0.10	0.91	0.62, 1.33	−0.05	−0.17, 0.07
Disseminated	0.75	0.57, 0.98	−0.08	−0.16, 0.00	0.72	0.55, 0.94	−0.08	−0.16, 0.01
Composite	0.72	0.53, 0.98	−0.10	−0.21, 0.01	0.65	0.47, 0.90	−0.13	−0.23, −0.02
Overall	0.72	0.57, 0.90	−0.09	−0.16, −0.02	0.69	0.56, 0.86	−0.09	−0.16, −0.03

Abbreviations: CI, confidence interval; HIV, human immunodeficiency virus; RD, rate difference; RR, rate ratio.

^a Adjusted for sex (male vs. female), age (years), marital status (single vs. not single), education (high school or more vs. not completing high school), and employment (unemployed vs. employed) and for time-varying covariates set to their baseline values: “crack” cocaine use (yes vs. no), powdered cocaine use (yes vs. no), benzodiazepine use (yes vs. no), heroin use (yes vs. no), participation in a drug treatment program in the past 6 months (yes vs. no), spent the night on the street in the past 6 months (yes vs. no), spent time in jail in the past 6 months (yes vs. no), frequency of excessive alcohol use (getting drunk vs. not), injected heroin in the past month (yes vs. no), injected both heroin and cocaine in the past month (yes vs. no), injected cocaine in the past month (yes vs. no), and number of days of injecting drugs in the past month (≤5 days, 6–14 days, or 15–29 days vs. every day).

^b One participant was missing information on spending the night on the street (in the past 6 months) and spending time in jail (in the past 6 months) at baseline.

^c Per 100 person-visits.

^d There were 204 events, 782 person-visits, and 270 people included.

^e There were 433 events, 1,319 person-visits, and 463 people included.

^f There were 381 events, 1,095 person-visits, and 387 people included.

^g There were 509 events, 1,598 person-visits, and 560 people included.