Table 1. Summarized information of the studies included in meta-analysis.

	Study year(s)	Study location	Settinga	Recruitment method(s)b	Sample size	Testing method used for estimating HIV incidencec	Background HIV prevalence (%)	Reported HIV incidence per 100 persons or 100 person-years
Feng LG, et al	2006	Chongqing	Internet, MSM bars, parks and bathhouses	SBR	1000	BED-CEIA	10.4	8.0
Han M, et al (1)d	2007	Chongqing	Internet, MSM bars, parks and bathhouses	SBR	1044	BED-CEIA	12.5	9.1
Han M, et al (2)d	2008	Chongqing			945	BED-CEIA	15.8	9.4
Hu HY, et al (1)e	2008	Jiangsu	NRf	NRf	948	RT-PCR	NRf	5.6
Hu HY, et al (2)e	2008	Jiangsu			NRf	BED-CEIA	NRf	7.5
Li SW, et al (1)d	2005	Beijing	Internet, MSM bars, parks and bathhouses	IBR	526	BED-CEIA	3.2	2.9
Li SW, et al (2)d	2006	Beijing			541	BED-CEIA	4.8	3.6
Zhang Y, et al	2007	Xinjiang	Internet	INR	143	BED-CEIA	6.5	6.7
Wang MJ, et al	2006	Chongqing	Internet, MSM bars, bathhouses, saunas, massage parlors	SBR, IBR	1000	BED-CEIA	10.3	7.3
Ruan YH, et al	2006–2008	Beijing	Internet, MSM bars, bathhouses, saunas, massage parlors	IBR, SBR	437	EIA-WB	4.8	2.6
Xu JJ, et al	2006–2007	Liaoning	NRf	SBR	122	EIA-WB	5.7	5.4
Yang HT, et al	2007–2008	Jiangsu	NRf	RDS	397	EIA-WB	4.6	5.1

^aThe places where the study subjects were recruited.

^bSBR, snowballing recruitment; RDS, respondent-driven sampling recruitment; IBR, internet-based recruitment; and SNR, social network recruitment.

^cBED-CEIA, BED capture enzyme immunoassay; RT-PCR, pooled RNA reverse transcription-PCR amplification assay; EIA-WB, enzyme immunoassay screening followed by Western blot confirmation.

^d(1) and (2) represent different studies from the same article.

^e(1) and (2) represent different studies from the same first author.

^fNR, not reported in original paper.