Table 3. Multivariate logistic regression analysis of HIV infection.

Factors	Reference group	B	s.e.	Wald	P	Exp (B)	95% CI
Average monthly income 2001–3000 Yuan	Other income groups	6.842	3.216	4.527	0.033	6.341	1.714–12.544
HIV-positive sex partner	No HIV-positive sex partner	1.663	0.618	7.249	0.007	5.273	1.572–17.691
More than 16 sex partners in the last 6 months	Less than 16 sex partners in the last 6 months	0.162	0.072	5.083	0.024	1.175	1.021–1.353
Had anal sex less than 10 times in the last month	Had anal sex more than 10 times in the last month	−6.001	2.425	6.121	0.013	0.002	0.000–0.287
Insertive anal sex	Recipient and both	−7.913	3.300	5.750	0.016	0.116	0.000–0.236
Sometimes used condomsa when having anal sex in the last 6 months	Always used condoms	7.105	2.385	8.873	0.003	7.601	1.359–23.083
Rectal trauma with bleeding in the last 6 months	No bleeding	1.081	0.414	6.802	0.009	2.947	1.308–6.638
Did not use condoms at last sexual encounter	Used condoms at last sexual encounter	0.772	0.366	4.456	0.035	1.278	1.012–5.595
Engaged in commercial sex	Did not engage in commercial sex	2.768	1.079	6.585	0.010	5.925	1.923–13.890

^a‘Sometimes used condoms' refers to MSM who did not insist on condom use during sexual encounters. This is compared to ‘always used condoms' and ‘never used condoms'. ‘Always used condoms' refers to MSM who correctly used condoms during every sexual encounter. ‘Never used condoms' refers to MSM who never used condoms during sexual encounters.