Table 2.

Estimated percentage of infections from older partners among men who have sex with men who are aged 13–24 years at HIV diagnosis, 2001–2012—21 U.S. states and the District of Columbia.

	Number of Young MSM	Number Linked with Older Partner	Percentage Linked with Older Partner		Unadjusted		Adjusted
			%	95% CI	PR	95% CI	PR	95% CI
Race/ethnicity
Black/African	1,862	520	27.9	(26.0-30.0)	0.58	(0.52-0.65)	0.65	(0.57-0.73)
American
Hispanic/Latino	677	296	43.7	(40.2-47.7)	0.91	(0.81-1.03)	0.86	(0.77-0.97)
Other	107	46	43.0	(35.0-53.9)	0.90	(0.72-1.14)	0.82	(0.65-1.03)
White	676	324	47.9	(44.2-51.8)	Ref		Ref
Region
Northeast	668	260	38.9	(35.4-42.8)	1.21	(1.04-1.39)	1.04	(0.90-1.21)
South	1,301	392	30.2	(27.8-32.8)	0.94	(0.82-1.07)	0.96	(0.84-1.10)
West	638	303	47.5	(43.8-51.6)	1.47	(1.29-1.68)	1.23	(1.07-1.41)
Midwest	713	230	32.3	(29.1-35.9)	Ref		Ref
Transmission category
MSM & IDU	111	53	47.7	(39.0-57.7)	1.35	(1.10-1.64)	1.11	(0.92-1.34)
MSM only	3,211	11,333	35.3	(33.7-37.0)	Ref		Ref
Age at diagnosis
20-24	2,507	851	33.9	(32.2-35.9)	0.83	(0.75-0.91)	0.72	(0.66-0.79)
13-19	815	335	41.1	(37.8-44.6)	Ref		Ref
Partner‘s race
Different	978	447	45.7	(42.7-49.0)	1.45	(1.33-1.59)	1.25	(1.14-1.38)
Same	2,344	739	31.5	(29.7-33.5)	Ref		Ref
Total	3,322	1186	35.7

The multivariable model included all variables listed and also controlled for year of diagnosis.