. 2011 Jun 23;3(1):e10. doi: 10.4081/idr.2011.e10

Table 1. Study information and estimated mean and median number of sexual partners in the past 6 and 12 months.

	Study design								Number of sexual partner
First author published year	Study Period	Study location	Age range (Mean)	Recruitment Method	Sampling method^†	Surveyed period^*	Types of partnerships	Sampling size	Mean	Median (95% CI)
Choi KH, 2004³⁰	2001–2002	Beijing	18–69 (27)	MSM Venues	Snowball and convenience	P6M	Unspecified	482	5.3	2.7 (0.3–26.9)
Mao M, 2008³¹	2003	Sichuan	16–76 (28)	MSM Venues	Random	P6M	Unspecified	491	6.1	3.0 (0.3–32.1)
Ma X, 2007³²	2004	Beijing	≥18	MSM network	RDS	P6M	Unspecified	325	3.4	1.7 (0.2–18.1)
Choi KH, 2007³³	2004–2005	Shanghai	18–56 (28)	MSM Venues	Snowball	P6M	Unspecified	477	3.0	1.4 (0.1–16.3)
Li X, 2008³⁴	2005	Beijing	17–54	MSM Venues and website advertisements	Multiple	P6M	Unspecified	526	5.5	1.8 (0.1–35.9)
Zhu JL, 2007³⁵	2005	Hefei	18–29 (20)	Peer-referral, website advertisements	RDS	P6M	Unspecified	122	1.5	0.9 (0.1–6.8)
Li N, 2007³⁶	2006	Henan	17–68 (28)	MSM Venues	N/A	P6M	Unspecified	160	5.3	2.6 (0.2–27.9)
Sun ZX, 2007³⁷	2006	Zhejiang	15–60+	Website advertisements	N/A	P6M	Unspecified	43	1.8	1.2 (0.2–7.0)
Feng L, 2009³⁸	2006	Chongqing	N/A	MSM Venues	Venue-based and cruising area-based convenience	P6M	Unspecified	1000	2.8	1.2 (0.1–15.9)
Ma X, 2007³²	2006	Beijing	≥16	MSM network	RDS	P6M	Unspecified	540	9.5	3.5 (0.2–59.3)
Chen SH, 2008³⁹	2006	Nanning	18–45	MSM who visited Nanning CDC for health counseling	Peer-referral	P6M	Unspecified	185	1.8	0.7 (0.0–11.0)
Wang Y, 2008⁸	2006–2007	Mianyang	16–57	MSM Venues	RDS	P6M	Regular	201	1.5	1.2 (0.3–4.5)
						P6M	Causal		1.7	0.7 (0.1–10.3)
						P6M	Commercial		0.8	0.4 (0.1–4.7)
Feng Y, 2010⁹	2007	Chengdu	16–44	MSM community	Snowball	P6M	Causal	512	3.6	1.3 (0.1–22.9)
Zhou J, 2008⁴⁰	2007	Guiyang	15–49 (24)	MSM Venues	N/A	P6M	Unspecified	255	1.8	1.4 (0.4–5.5)
Liu H, 2009⁴¹	2007	Shenzhen	18–45	MSM Venues	RDS	P6M	Unspecified	351	6.1	2.0 (0.1–39.5)
Feng L, 2009³⁸	2007	Chongqing	N/A	MSM Venues	Venue-based and cruising area-based convenience	P6M	Unspecified	1044	3.8	1.1 (0.0–25.7)
Liang L, 2009⁴²	2008	Hebei	N/A	MSM who visited CDC for HIV voluntary counseling and testing	SBS	P6M	Unspecified	450	3.1	1.6 (0.1–16.3)
Zhao H, 2009⁴³	2008	Harbin	17–52 (25)	MSM who visited CDC for HIV voluntary counseling and testing	VDT	P6M	Unspecified	89	4.6	1.9 (0.1–26.9)
Zhou SJ, 2008⁴⁴	2008	Chongqing	16–59 (30)	MSM Venues	N/A	P6M	Unspecified	339	3.3	1.9 (0.3–14.9)
Gu Y, 2004⁴⁵	2003	Shenyang	16–49	MSM Venues	N/A	P12M	Unspecified	333	7.4	2.3 (0.1–49.5)
Cai WD, 2005⁴⁶	2004	Shenzhen	17–58 (26)	MSM Venues	N/A	P12M	Unspecified	218	29.2	9.9 (0.5–187.8)
Ma X, 2007³²	2005	Beijing	≥16	MSM network	RDS	P12M	Unspecified	427	19.4	5.9 (0.3–129.6)
Chen SH, 2008³⁹	2006	Nanning	18–45	MSM who visited Nanning CDC for health Counseling	Peer-referral	P12M	Unspecified	185	3.8	0.1 (0.0–21.4)
Cai YM, 2008⁴⁷	2006	Shenzhen	18–53 (27)	MSM Venues	Venue-based	P12M	Unspecified	458	10.1	4.2 (0.3–58.8)
Ma X, 2007³²	2006	Beijing	≥16	MSM network	RDS	P12M	Unspecified	540	17.2	6.1 (0.3–108.6)
Ruan S, 2008⁴⁸	2007	Jinan	N/A	MSM network	RDS	P12M	Unspecified	428	9.0	4.3 (0.4–49.0)

^†

RDS, Respondent-driven sampling;

P6M, Past 6 months; P12M: Past 12 months.