Estimating the Population Size of Men Who Have Sex with Men in the United States to Obtain HIV and Syphilis Rates§

Table 4: Estimated Number, Rate Per 100,000 Persons, and Rate Ratios for Diagnoses of HIV Infection in 2008, 37 States with Confidential Name-Based HIV Infection Reporting, for MSM, Other Men, Women, and MSM by Race/Ethnicity and Age

	Estimated Number of HIV Diagnoses	Estimate rate per 100,000 Population (95% CI )	Rate Ratio (95% CI)^*
MSM and Other Men
Other Men	8,286	10.1 (10.0 – 10.1)	ref
MSM	22,469	672 (596 – 749)	67 (59 – 75)
MSM and Women
Women^#	10,332	11.5	ref
MSM	22,469	672 (596 – 749)	58 (52 – 65)
MSM Race/Ethnicity
White	8,478	363 (322 – 405)	ref
Hispanic	4,201	980 (869 – 1,092)	2.7
Black/ African American	9,133	2,165 (1,919 – 2,412)	6.0
MSM Age at Diagnosis (in Years):
13–24	5,032	713 (632 – 795)	ref
25–34	6,380	1,126 (998 – 1,255)	1.6
35–44	6,041	1,048 (929 – 1,168)	1.5
45–54	3,709	624 (553 – 696)	0.9
55+	1,306	145 (129 – 162)	0.2

^* There are no confidence intervals for rate ratios for MSM race/ethnicity or age because the proportion of men in each subgroup does not change as the proportion of MSM in the population changes.

^# There are no confidence intervals for women because the rate calculation uses U.S. census count, not an estimated number as with MSM and other men.