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Table 3. Factors associated with HIV seroconversion identified using a proportional hazards regression model.

From: HIV incidence among men who have sex with men using geosocial networking smartphone application in Beijing, China: an open cohort study

  HR (95% CI) P value
Number of sexual partners
 0–1
 2–5 1.30 (0.64–2.67) 0.47
 ≥ 6 2.65 (1.04–6.67) 0.04
Using condom for anal sex
 Never
 Sometimes 0.72 (0.20–2.56) 0.61
 Every time 0.27 (0.07–0.96) 0.04
HIV-positive partners
 No
 Yes 3.82 (1.16–12.64) 0.03
 Not sure 2.02 (0.95–4.30) 0.07
Sex role for anal sex
 Exclusively receptive
 Exclusively insertive 0.23 (0.08–0.62) < 0.01
 Versatile 0.93 (0.46–1.88) 0.84
  1. HR hazard ratio, CI confidence interval,–means not applicable
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