Table 3.

Weighted estimates for joint effects of alcohol consumption and injection drug use in the prior six months on HIV acquisition before and after 3 years of follow-up among 1525 African American injection drug users followed for 8181 person-years, ALIVE cohort, 1988–2008.

Injections/week	No. Drinks/week	No. HIV infections person-years	Weighted ^a Hazard Ratio (95% CI)
Injections/week	No. Drinks/week	No. HIV infections person-years	Within the first 3 years of follow-up	After the first 3 years of follow-up
1–39	21–140	53/1475	3.40 (1.13–10.23)	2.35 (1.33–4.16)
	0–20	68/3283	2.91 (0.97–8.75)	1.49 (0.88–2.55)
	Overall	121/4758
0	21–140	7/436	3.17 (0.78–12.83)	1.11 (0.33–3.74)
	0–20 ^b	27/2987	1.00	1.00
	Overall	34/3423
Overall		155/8181

Accounted for age at entry, sex, years of education, cocaine use, shooting gallery attendance, number of sexual partners, male sex with men, as well as sexually transmitted infections including genital herpes simplex virus, genital warts, gonorrhea, and syphilis.

Reference category.