TABLE 2.

Prevalence of male-male sex and injection drug use, by urbanicity and US census region, National Health and Nutrition Examination Survey, 1999–2010

		Ever had male-male sex (of men)	Ever had male-male sex (of all persons)	Had male-male sex, past 12 mo (of men)	Had male-male sex, past 12 mo (of all persons)	Ever injected drugs	Injected drugs, past 12 mo
		% (95 % CI)	% (95 % CI)	% (95 % CI)	% (95 % CI)	% (95 % CI)	% (95 % CI)
Overall	N = 23037	4.7 (4.1–5.4)	2.2 (1.9–2.5)	2.5 (2.0–3.0)	1.2 (0.9–1.4)	2.3 (2.0–2.6)	0.3 (0.2–0.4)
Urbanicitya	p value	0.0004	0.0004	0.0002	0.0002	0.3	0.6
Large Central Metro	N = 9060	7.0 (5.6–8.6)	3.2 (2.6–4.0)	4.4 (3.4–5.7)	2.0 (1.6–2.6)	2.0 (1.6–2.5)	0.3 (0.1–0.5) c
Large Fringe Metro	N = 3916	4.6 (3.4–6.1)	2.2 (1.6–3.0)	2.5 (1.7–3.8)	1.2 (0.8–1.9)	2.2 (1.5–3.1)	0.3 (0.2–0.6) c
Medium/Small Metro	N = 6820	3.8 (3.0–4.9)	1.8 (1.4–2.3)	1.4 (0.9–2.2)	0.6 (0.4–1.0)	2.2 (1.7–2.9)	0.3 (0.1–0.4)
Nonmetro	N = 3233	2.6 (1.7–3.9)	1.2 (0.8–1.8)	1.1 (0.5–2.5) c	0.5 (0.2–1.2) c	3.0 (2.2–4.0)	0.5 (0.2–1.0) c
Regionb	p value	0.4	0.4	0.5	0.5	0.0002	0.3
Northeast	N = 3643	4.7 (3.3–6.6)	2.2 (1.5–3.1)	1.9 (1.0–3.6) c	0.9 (0.5–1.7) c	1.3 (0.9–1.7)	0.2 (0.1–0.4) c
Midwest	N = 4571	4.6 (3.4–6.2)	2.2 (1.6–3.0)	2.1 (1.3–3.3)	1.0 (0.6–1.6)	1.7 (1.3–2.3)	0.3 (0.1–0.6) c
South	N = 8809	4.2 (3.5–5.1)	2.0 (1.6–2.4)	2.6 (2.0–3.4)	1.2 (0.9–1.6)	2.4 (1.9–3.0)	0.3 (0.2–0.6)
West	N = 6014	5.7 (4.4–7.4)	2.7 (2.1–3.5)	3.0 (2.0–4.6)	1.4 (0.9–2.2)	3.3 (2.6–4.3)	0.4 (0.2–0.8) c

^aCounties assigned to urbanicity levels in accordance with 2006 NCHS urban-rural classification scheme. Due to missing data, urbanicity levels do not sum to overall number

^bStates assigned to regions in accordance with US Census Bureau determinations

^cRelative standard error between 30 % and 50 %