Table 4.

Poisson regression analysis of factors associated with HIV infection among MSM^a in Maanshan, China

Variable	β	SE	Wald	P-value	ORb (95% CIc)
Age (years old)	0.015	0.010	2.517	0.113	1.02(1.00-1.04)
Education level
Increase from low level to higher	-0.238	0.090	6.414	0.011	0.79(0.66–0.95)
Occupation (Reference: student)
Farmer	-0.743	1.111	0.447	0.504	0.48(0.05–4.20)
Laborer	0.683	0.366	3.476	0.062	1.98(0.97–4.06)
Public institutions	0.353	0.523	0.455	0.500	1.42(0.51–3.97)
Freelancer	1.391	0.366	14.479	< 0.001	4.02(1.96–8.23)
Others	1.098	0.414	7.031	0.008	3.00(1.33–6.75)
Monthly income (yuan/RMB)
Increase from small number to bigger	-0.384	0.092	17.605	< 0.001	0.68(0.57–0.82)
Scope of sex partner distribution
Increase from small area to bigger	0.575	0.138	17.478	< 0.001	1.78(1.36–2.33)
Number of MSM friends
Increase from small number to bigger	0.326	0.197	2.744	0.098	1.39(0.94–2.04)
Ever had group sex (Reference: no)	0.853	0.404	4.464	0.035	2.35(1.06–5.17)
The role of anal sex with men in the past 6 months (Reference: insertive)
Receptive	0.930	0.360	6.693	0.010	2.54(1.25–5.13)
Versatile	0.852	0.297	8.246	0.004	2.34(1.31–4.19)
Condom use in anal sex with men in the past 6 months
Increase from never use to consistent use	-0.637	0.217	8.648	0.003	0.53(0.35–0.81)
Number of oral sex partner in the past 6 months
Increase from small number to bigger	-1.061	0.195	29.670	< 0.001	0.35(0.24–0.51)
Non-steady sex partners in the past 6 months (Reference: no)	0.760	0.160	22.447	< 0.001	2.14(1.56–2.93)
Number of male sexual partners
Increase from small number to bigger	0.744	0.185	16.225	< 0.001	2.11(1.47–3.02)
Illicit drug use during sex with men (Reference: no)	2.123	0.747	8.078	0.004	8.36(1.93–36.14)

^a Men who have sex with men; ^b Odds ratio; ^c Confidence interval; ^d Sex workers, unemployed and retired people