Prevalence estimates of unprotected anal intercourse by study features and sample characteristics among HIV-positive MSM.
| No. of studies | n | Prevalence estimate and 95% CI | ||||
| Prevalence estimate (%) | Lower 95% CI | Upper 95% CI | P Value | |||
| UAI mode | ||||||
| Insertive UAI | 2 | 312 | 46.5 | 41.0 | 52.0 | <0.05 |
| Receptive UAI | 3 | 325 | 48.3 | 43.0 | 53.8 | |
| Sampling method | ||||||
| RDS or snowball sampling | 6 | 893 | 63.2 | 50.5 | 75.1 | <0.05 |
| Convenience sampling | 9 | 187 | 75.9 | 64.4 | 85.7 | |
| Recruitment setting | ||||||
| MSM venues or internet | 8 | 174 | 76.0 | 63.2 | 86.8 | <0.05 |
| Clinics | 3 | 224 | 67.0 | 34.6 | 92.3 | |
| Data collection method | ||||||
| Self-administered | 3 | 206 | 67.5 | 25.3 | 97.2 | <0.05 |
| Interviewer administered | 8 | 989 | 74.8 | 64.8 | 83.7 | |
| Data collection period | ||||||
| 2005–2007 | 7 | 377 | 83.9 | 73.6 | 92.1 | <0.05 |
| 2008–2009 | 10 | 1171 | 70.6 | 60.0 | 80.1 | |
| Location | ||||||
| Beijing | 3 | 229 | 59.8 | 36.5 | 81.0 | <0.05 |
| Chongqing | 3 | 350 | 83.5 | 68.5 | 94.4 | |
| Jiangsu | 3 | 94 | 69.3 | 47.4 | 87.4 | |
| Sample size | ||||||
| <50 | 11 | 181 | 77.6 | 65.1 | 88.0 | <0.05 |
| >50 | 7 | 1422 | 72.8 | 61.4 | 82.9 | |
UAI, unprotected anal intercourse; RDS, respondent-driven sampling.