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Table 1 Prevalence of HIV infection among older MSM in China

From: High prevalence of HIV infection and unprotected anal intercourse among older men who have sex with men in China: a systematic review and meta-analysis

First author, published year Study design Older MSM Younger MSM
  Location Study year Sampling method Recruitment settings Sample size HIV infectiona Syphilis infectionb UAI Sample size HIV infection Syphilis infection UAI
Ma AB, 2007 Yunnan 2005 Mixedc Medical settings 8 1 NRd NR 70 7 NR NR
Xi SJ, 2011 Hangzhou 2009-2010 Snowballing Multiple gay venues or events 16 1 NR NR 514 44 NR NR
Long QP, 2012 Hunan 2011 Mixed Multiple gay venues or events 33 7 NR 27 233 36 NR 178
Zhou JB, 2012 Changzhou 2007 Snowballing Multiple gay venues or events 43 12 18 NR 550 69 167 NR
Wang ZC, 2012 Xining 2011 Mixed Medical settings 21 2 0 17 382 45 40 233
Qun He, 2006 Guangzhou 2003 Mixed Medical settings 23 0 NR NR 201 0 NR NR
Xuan ZB, 2012 Shanghai 2010-2011 Snowballing Medical settings 9 0 NR 7 89 3 NR 64
Chu ZX, 2011 Shenyang 2008 Snowballing Medical settings 56 4 11 50 2018 96 234 1888
Yan Xiao, 2010 20 cities 2006 Snowballing Multiple gay venues or events 1009 55 NR 834 2961 91 NR 2034
Wu ZY, 2013 61 Cities 2008- 2009 RDSe Medical settings 1182 90 274 813 45478 2196 5226 23294
Zhou YQ, 2012 Shanghai 2010- 2011 Mixed Medical settings 6 1 2 NR 288 17 36 NR
Yang LG, 2012 Fuyang 2010-2011 Mixed Multiple gay venues or events 2 0 NR 2 263 15 NR 163
Lan GH, 2009 Guangxi 2008 Snowballing Medical settings 41 2 5 28 1105 18 60 613
Feng F, 2009 Haikou 2008 Mixed Medical settings 4 0 NR NR 100 2 NR NR
Zhang FX, 2011 Suzhou 2008- 2009 Mixed Medical settings 38 2 NR 27 616 56 NR 384
Li R, 2010 Dalian 2009 Snowballing Multiple gay venues or events 6 2 NR NR 396 16 NR NR
Chen Y, 2013 Guizhou 2008- 2009 Mixed Multiple gay venues or events 32 14 NR 27 798 179 NR 513
Ni ZM, 2011 Hangzhou 2009 Mixed Multiple gay venues or events 5 1 1 NR 214 33 43 NR
Xu J, 2010 4 cities 2008 RDS Medical settings 252 24 NR 214 1612 101 NR 1259
Zheng LX, 2012 Longyan 2010- 2011 Snowballing Multiple gay venues or events 26 2 NR NR 377 13 NR NR
  1. aBlood specimens were detected by Enzyme-Linked Immuno Sorbent Assays (ELISA) and Western Blot assay (WB) to confirm HIV infection in all the included studies; bBlood specimens were detected by Rapid Plasma Reagin (RPR) and Treponema Pallidum Particle Agglutination assay (TPPA)to confirm syphilis infection in all the included studies; cMixed: Snowballing or/and RDS or/and convenience sampling were included; dNR: Not reported; eRDS: Respond Driven Sampling.