Table 2.

Factors associated with HIV infection among 3717 Chinese MSM

Characteristic	No. of MSM HIV positive (%)	Crude OR (95% CI)	P-value	AOR (95% CI)	P-value
Commercial sex
NC-MSM	378 (10.9)	Ref.	0.55	Ref.	0.88
MSM-buying	13 (12.6)	1.2 (0.7–2.1)		1.1 (0.5–2.5)
MSM-selling	20 (13.4)	1.3 (0.8–2.1)		1.2 (0.5–2.6)
Syphilis positive
No	333 (9.8)	Ref.	<0.001	Ref.	<0.001
Yes	78 (23.9)	2.9 (2.2–3.8)		2.0 (1.4–2.8)
HSV-2 positive
No	275 (9.2)	Ref.	<0.001	Ref.	<0.001
Yes	88 (21.5)	2.7 (2.1–3.5)		2.3 (1.7–3.1)
Age (per year)		1.0 (1.0–1.1)	0.001	1.0 (0.9–1.0)	0.24
Married to a woman
No	293 (10.4)	Ref.	0.018	Ref.	0.18
Yes	118 (13.2)	1.3 (1.0–1.7)		1.2 (0.9–1.6)
Time living in the study city
>6 months	317 (11.4)	Ref.	0.023	Ref.	0.031
≤6 months	42 (16.1)	1.5 (1.1–2.1)		1.5 (1.0–2.2)
Student
No	376 (11.9)	Ref.	<0.001	Ref.	0.002
Yes	35 (6.4)	0.5 (0.4–0.7)		0.5 (0.3–0.8)
Education
College or above	210 (9.9)	Ref.	0.008	Ref.	0.15
High school or below	201 (12.6)	1.3 (1.1–1.6)		1.2 (0.9–1.5)
Seeking partners online
No	121 (10.5)	Ref.	0.6	Ref.	0.72
Yes	284 (11.1)	1.1 (0.8–1.3)		1.1 (0.8–1.4)
Number of male sex partners in past 6 months
0–2	220 (9.5)	Ref.	<0.001	Ref.	0.023
3–9	147 (14.0)	1.5 (1.2–1.9)		1.4 (1.1–1.8)
≥10	34 (11.6)	1.2 (0.8–1.8)		1.1 (0.7–1.7)
Drug use in past 6 months
No	237 (10.1)	Ref.	<0.001	Ref.	<0.001
Yes	144 (16.3)	1.7 (1.4–2.1)		1.7 (1.3–2.2)
UAI in past 6 months
No	123 (8.8)	Ref.	<0.001	Ref.	0.001
Yes	288 (12.4)	1.5 (1.2–1.8)		1.5 (1.2–1.9)
Predominant anal sex position
Receptive	265 (12.8)	Ref.	<0.001	Ref.	0.014
Insertive	139 (9.0)	0.7 (0.5–0.8)		0.7 (0.6–0.9)