Table 2. The Pooled UAI Prevalence with Any Male Partner, by Subgroups.
| Stratified variables | No. of studies | Pooled sample size | Number of MSM with UAI | Pooled UAI prevalence and 95%CI (%) | QB | P value |
| Data collection period | 15.74 | 0 | ||||
| 2001–2007 | 17 | 7909 | 4708 | 61(57–66) | ||
| 2008–2012 | 47 | 23453 | 11555 | 50(48–53) | ||
| Region† | 1.18 | 0.88 | ||||
| Northeast | 12 | 6217 | 3152 | 57(49–65) | ||
| North China | 5 | 3003 | 1592 | 55(47–62) | ||
| East China | 23 | 9567 | 4982 | 53(49–57) | ||
| Southwest | 15 | 7971 | 4365 | 53(48–57) | ||
| South central | 7 | 3604 | 1685 | 51(42–60) | ||
| Sampling method | 8.68 | 0 | ||||
| RDS | 10 | 3593 | 2166 | 61(56–67) | ||
| Other methods | 54 | 27769 | 14097 | 52(49–55) | ||
| Study type | 3.17 | 0.08 | ||||
| Cross-sectional study | 56 | 29053 | 14915 | 52(50–55) | ||
| Other types | 8 | 2309 | 1348 | 60(52–68) | ||
| Data collection method | 0.77 | 0.68 | ||||
| Interviewer | 50 | 25997 | 13496 | 53(50–56) | ||
| Self | 5 | 2418 | 1194 | 51(45–57) | ||
| both | 3 | 1157 | 565 | 50(43–57) | ||
| HIV prevalence | 5.8 | 0.02 | ||||
| ≤5% | 24 | 11776 | 6058 | 57(51–61) | ||
| >5% | 27 | 15898 | 8129 | 49(46–52) | ||
| Recruitment settings | 3.99 | 0.14 | ||||
| Medical facilities | 24 | 9764 | 4939 | 52(49–55) | ||
| MSM venues | 6 | 2909 | 1657 | 60(53–67) | ||
| No report | 34 | 18689 | 9667 | 53(49–57) |
†
: Region division referred the government website (http://www.xzqh.org.cn/ONEWS_zq.asp?id=6162). Two articles were excluded: one in Ningxia in the northwest region, and one in Guangdong and Sichuan across two regions.