Table 2.

Risk factors for early HIV infection among men who have sex with men, 5-city pilot study, National HIV Behavioral Surveillance, 2011

	Total at riska No.	Percent with early infection among those at riska
		%	Relative risk 95 % CI	Adjusted relative risk 95 % CI
Racial/ethnicityb
Black	206	3.9	4.8 (1.5, 16.0)	1.1 (0.3, 5.3)
Other	499	0.8	1.0	1.0
Age group (years)
18–24	213	1.9	1.2 (0.4, 3.8)
25+	492	1.6	1.0	N.A.
Education
High school or less	240	2.9	2.7 (0.9, 8.5)
Some college or higher	465	1.1	1.0	N.A.
Cityb
Baltimore	200	3.5	3.5 (1.1, 11.0)	1.6 (0.4, 6.3)
Other	505	1.0	1.0	1.0
Past 12 months behaviors
Number of male partners—12 months
1	137	0.7	0.3 (0.04, 2.9)
2–4	281	1.8	0.9 (0.3, 2.8)
5+	287	2.1	1.0	N.A.
Stimulant use
Yes	220	0.9	0.4 (0.1, 2.0)
No	483	2.1	1.0	N.A.
Characteristics of last sex partner
Partner age
Younger	287	1.7	2.1 (0.2, 17.4)	N.A.
Older	298	2.0	2.4 (0.3, 19.5)
Same Age	118	0.8	1.0
Partner type
Main	312	1.6	0.9 (0.3, 3.2)
Casual	393	1.8	1.0	N.A.
Partner race/ethnicityb
Black	209	4.3	6.4 (1.7, 24.0)	4.6 (1.2, 17.3)
Other	492	0.6	1.0	1.0
Receptive anal sex at last sexb
Yes	262	3.1	3.1 (0.9, 10.3)	4.3 (1.2, 15.0)
No	446	0.9	1.0	1.0
Receptive anal sex without a condom
Yes	122	2.5	2.0 (0.5, 7.5)
No	584	1.7	1.0	N.A.
Frequency of Internet use to meet sex partnersb
≥Once a day	140	4.3	3.7 (1.1, 12.6)	3.3 (1.1, 9.7)
<Once a day to never	563	1.1	1.0	1.0
Total	708

N/A non-applicable

^aWe excluded long-term infections (HIV serology positive not determined as recent by the avidity-based assay) and compared individuals with early infection to HIV-uninfected MSM

^bConsidered for multivariate model