| First author, published year | Sample size | Sampling methods | Location | Economy status | Prevalence (%) | HIV | Syphilis |
| Liang, 2011 [35] | 511 | Multiple methods | Foshan | Developed | 7.0 | 8.0 | Sun, 2009 [50] | 401 | Multiple methods | Dalian | Developed | 4.2 | 17.5 | Yang, 2012 [72] | 264 | VCT | Fuyang | Developing | 5.7 | | Chen, 2012 [15] | 400 | Snow ball | Guilin | Developing | 3.5 | 4.0 |
Wen, 2010 [64] | 452 | Snow ball | Guangzhou | Developed | 4.9 | 6.0 | Huang, 2011 [32] | 395 | Snow ball | Hefei | Developing | 3.0 | 13.4 | Wang, 2009 [54] | 1348 | Multiple Methods | Heilongjiang | Developing | 2.3 | 14.8 | Wang, 2010 [61] | 200 | Snow ball | Lanzhou | Developing | 7.0 | 12.5 | Wang, 2012 [58] | 400 | RDS | Mianyang | Developing | 11.0 | 23.5 | Lu, 2011 [40] | 354 | RDS | Nanchang | Developing | 4.2 | 7.9 | Chen, 2010 [3] | 469 | Snow ball | Nanning | Developing | 1.7 | 10.7 | Bao, 2009 [11] | 6101 | RDS | 14 cities | Classifieda | 6.3 | 14.0 | Chen, 2012 [16] | 300 | Snow ball | Yangzhou | Developed | 7.3 | 22.0 | Li, 2009 [34] | 1773 | Multiple methods | Chongqing | Developing | 10.6 | 8.4 | Guo, 2009 [27] | 204 | Venues-based | Tianjin | Developed | 5.9 | 18.7 |
Liu, 2012 [90] | 507 | Snow ball | Changsha | Developed | 4.3 | 25.1 |
Qu, 2011 [91] | 805 | Snow ball | 2 cities | Developed | 3.7 | 14.1 | Chen, 2011 [12] | 831 | VCT | Kunming | Developing | 11.4 | 13.6 | Zhou, 2011 [83] | 1166 | Snow ball | Chongqing | Developing | 14.8 | 8.7 |
Han, 2012 [92] | 272 | Venues-based | Taiyuan | Developing | 8.5 | 13.6 |
Tang, 2011 [93] | 408 | Venues-based | Guilin | Developing | 2.5 | 4.9 | Xu, 2011 [69] | 436 | Venues-based | Liaoning | Dropped outb | 3.0 | 5.0 |
Bai et al., 2011 [94] | 280 | Snow ball | Suzhou | Developed | 7.1 | 15.0 |
Zhou, 2011 [95] | 491 | RDS | Chongqing | Developing | 14.9 | 5.1 | Fan, 2012 [47] | 500 | RDS | Beijing | Developed | 8.0 | 22.0 |
Liao et al., 2011 [96] | 2996 | Multiple methods | Shandong | Developed | 2.5 | 5.5 |
Feng et al., 2009 [97] | 2044 | Venues-based | Chongqing | Developing | 11.5 | 8.9 | He, 2009 [29] | 423 | RDS | Guangzhou | Developed | 1.3 | 14.8 |
Eric, 2011 [98] | 288 | Snow ball | Yuxi | Developing | 10.8 | | Zheng, 2012 [81] | 157 | Multiple methods | Beijing | Developed | 2.5 | 7.0 | Wei, 2011 [63] | 220 | Snow ball | Taizhou | Developing | 13.4 | 14.5 |
Zhong et al., 2011 [99] | 379 | RDS | Guangzhou | Developed | 5.2 | 17.5 | Zhang, 2012 [74] | 503 | RDS | Chongqing | Developing | 15.7 | 6.6 | Xiao, 2009 [66] | 1692 | Multiple methods | Chongqing | Developing | 10.8 | 8.6 | Xiao, 2010 [67] | 4983 | Multiple methods | 20 cities | Dropped outb | 2.9 | 9.8 |
Zhang et al., 2011 [100] | 302 | Snow ball | Beijing | Developed | 9.9 | 19.2 |
Zhang et al., 2012 [101] | 3314 | Snow ball | Chongqing | Developing | 14.2 | 9.4 | Zhang, 2013 [75] | 463 | Snow ball | Harbin | Developing | 9.5 | 14.3 |
Guo et al., 2009 [102] | 433 | Venues-based | 2 cities | Developed | 5.8 | 27.7 |
Ruan et al., 2009 [103] | 541 | Multiple methods | Beijing | Developed | 4.8 | 19.8 |
Zou et al., 2010 [104] | 429 | Internet | 2 cities | Classifieda | 4.8 | 11.4 |
Wang, 2011 [105] | 2020 | Surveillance | 4 cities | Developing | 2.3 | |
Gao, 2012 [106] | 962 | Multiple methods | Beijing | Developed | 6.3 | 17.7 |
Zhou et al., 2010 [107] | 550 | Multiple methods | Beijing | Developed | 4.5 | |
Zhou, 2012 [108] | 294 | VCT | Shanghai | Developed | 6.1 | 9.5 | Ouyang, 2009 [44] | 617 | RDS | Chongqing | Developing | 16.8 | 10.9 | Meng, 2010 [42] | 287 | Multiple methods | Changde | Developing | 3.5 | 12.9 | Tang, 2012 [52] | 303 | Multiple methods | Dazhou | Developing | 3.6 | 1.7 | Sun, 2012 [49] | 2006 | Multiple methods | Dalian | Developed | 5.2 | 16.6 |
Dai, 2011 [109] | 1315 | VCT | Guangzhou | Developed | 5.4 | 6.8 |
Mou, 2012 [110] | 1526 | Venues-based | Guangzhou | Developed | 5.7 | | Wen, 2010 [64] | 452 | Snow ball | Guangzhou | Developed | 4.9 | 6.0 |
Wang, 2011 [111] | 300 | RDS | Kunshan | Developed | 5.3 | 25.0 |
Sun, 2010 [112] | 1350 | RDS | 2 cities | Developing | 5.2 | 7.3 | Zhu, 2011 [88] | 259 | Surveillance | Wuxi | Developed | 13.9 | 25.1 | Zhang, 2009 [76] | 231 | RDS | Urumqi | Developing | 2.2 | 10.8 |
Chen, 2011 [113] | 889 | Snow ball | Lanzhou | Developing | 6.0 | 13.6 |
Hong et al., 2009 [114] | 593 | Venues-based | Changzhou | Developed | 13.7 | 31.2 | Liu, 2012 [37] | 661 | Snow ball | Nanjing | Developed | 3.9 | 11.5 |
He, 2012 [115] | 235 | Multiple methods | Geermu | Developing | 4.3 | 0.9 | Gong, 2010 [24] | 252 | Snow ball | Quanzhou | Developing | 2.6 | 2.2 | Zhang, 2012 [77] | 300 | RDS | Shenzhen | Developed | 7.0 | 12.0 | Pan, 2012 [45] | 675 | Multiple methods | Shenzhen | Developed | 8.0 | 41.2 |
Shi, 2010 [116] | 906 | Venues-based | Shenzhen | Developed | 4.2 | 14.5 |
Cai, 2012 [117] | 5232 | VCT | Shenzhen | Developed | 6.5 | 21.0 | Wang, 2010 [55] | 900 | RDS | Shenyang | Developed | 9.3 | 11.0 |
Wang, 2011 [118] | 450 | Venues-based | Shijiazhuan | Developing | 2.2 | 7.6 | Wang, 2010 [61] | 150 | Snow ball | Shijiazhuan | Developing | 6.7 | 11.3 |
Bai et al., 2011 [119] | 280 | Multiple methods | Suzhou | Developed | 7.3 | 22.0 |
Zhang et al., 2011 [73] | 717 | Multiple methods | Suzhou | Developed | 8.1 | 14.6 |
Xu et al., 2012 [70] | 211 | Multiple methods | Taizhou | Developing | 10.0 | 11.8 |
Wang et al., 2011 [57] | 201 | Snow ball | Urumqi | Developing | 6.5 | 7.0 |
Liu et al., 2010 [38] | 456 | RDS | Wuhan | Developed | 6.6 | 21.9 |
Zhang et al., 2011 [80] | 404 | Snow ball | Xining | Developing | 7.2 | 8.4 |
Wang et al., 2010 [62] | 750 | Multiple methods | Yangzhou | Developed | 9.3 | 22.8 |
Chen et al., 2012 [14] | 218 | Snow ball | Chongqing | Developing | 16.5 | 15.1 |
Yang et al., 2011 [71] | 305 | Multiple methods | Dali | Developing | 3.0 | 2.0 |
Luo et al., 2012 [41] | 1237 | Snow ball | 13 cities | Developing | 8.2 | 3.9 | Xu, 2010 [68] | 1864 | Multiple methods | 4 cities | Classifieda | 6.7 | |
Ding et al., 2010 [19] | 743 | Snow ball | Chongqing | Developing | 16.6 | 8.5 |
Ding et al., 2010 [20] | 202 | Snow ball | Chongqing | Developing | 12.9 | 5.0 | Li, 2009 [34] | 1691 | Multiple methods | Chongqing | Developing | 10.9 | 8.6 |
Feng, 2010 [22] | 946 | Snow ball | Chongqing | Developing | 15.8 | |
Guo et al., 2012 [25] | 109 | Surveillance | Zunyi | Developing | 10.1 | 1.0 |
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