Table 2.

Stratified analyses of HIV prevalence among MSM in China

Variable	Number of studies	HIV prevalence	Heterogeneity of included studies
			I2	Q	p	OR
Age (yrs.)
<20	33	4.6% [3.4%; 6.3%]	64.0%	79.4	<  0.0001
20-29	32	7.2% [5.9%; 8.7%]	91.6%	276.2	<  0.0001
30-39	30	11.8%[10.0%; 13.8%]	75.2%	120.8	<  0.0001
40-49	30	13.8%[11.0%; 17.1%]	51.8%	37.4	0.0047
50+	13	19.3%[13.1%; 27.4%]	50.2%	26.1	0.0166
Sampling methods
RDS	39	5.4% [4.7%; 6.3%]	90.3%	627.4	<  0.0001
Snowball	126	6.4% [5.9%; 7.0%]	96.6%	3132.0	<  0.0001
Time-venue	83	5.4% [4.6%; 6.3%]	96.9%	2694.4	<  0.0001
Convenience	11	4.2% [3.3%; 7.3%]	96.2%	173.5	<  0.0001
Multiple methods	42	5.0% [3.9%; 6.4%]	99.0%	3762.7	<  0.0001
Marital status
Single	57	6.4% [5.5%; 7.5%]	94.5%	876.3	<  0.0001
Cohabitating	21	11.5% [7.8%; 16.5%]	67.8%	65.3	<  0.0001
Married	42	10.6% [9.2%; 12.0%]	72.5%	152.9	<  0.0001
Divorced or widowed	49	12.8%[10.0%; 16.4%]	81.6%	240.9	<  0.0001
Current level of education
Illiterate	3	16.8% [6.4%;37.3%]	0.0%	0.8	0.6683
Primary school	11	15.6% [11.0%;21.6%]	25.4%	14.7	0.1948
Junior high school	20	9.8% [7.4%; 12.9%]	86.8%	151.8	<  0.0001
Senior high school	50	7.6% [6.4%; 9.0%]	89.5%	428.6	<  0.0001
College or above	62	5.7% [5.0%; 6.5%]]	87.7%	464.9	<  0.0001
Sexual orientation
Homosexual	23	7.0% [5.4%; 9.1%]	93.4%	540.3	<  0.0001
Bisexual	10	6.1% [4.5%; 8.3%]	69.0%	32.2	0.0004
Heterosexual	11	7.5% [4.4%; 12.7%]	59.3%	27.0	0.0045
Undetermined	7	7.6% [3.2%; 16.8%]	0.0%	15.4	0.0175
Main location to seek homosexual partners
Internet	20	7.3% [5.8%; 9.1%]	94.2%	314.7	<  0.0001
Parks	19	6.0% [4.8%; 7.4%]	38.2%	38.2	0.0037
Public bathhouses/saunas	22	13.4%[10.3%; 17.1%]	88.6%	162.3	<  0.0001
Bar/night/club/tearoom	23	7.4% [5.8%; 9.3%]	98.9%	141.2	<  0.0001
Ethnicity
Han Chinese	15	6.3% [4.9%; 8.0%]	95.6%	317.7	<  0.0001	0.78[0.30,2.03]
Other	15	7.0% [3.4%; 14.0%]	93.6%	218.9	<  0.0001
Condom use (in the last 6 months)
During sex with men
Always	27	4.4% [3.3%; 5.8%]	91.1%	321.5	<  0.0001
Sometimes	27	8.2% [6.3%; 10.5%]	96.0%	510.5	<  0.0001
Never	27	9.9% [7.4%;13.1%]	84.5%	145.1	<  0.0001
During commercial sex with men
Always	15	2.9% [1.6%; 5.0%]	69.8%	39.8	<  0.0001
Sometimes	15	6.6% [4.0%; 10.7%]	85.2%	59.8	<  0.0001
Never	14	8.5% [5.3%; 13.2%]	26.3%	23.7	0.0345
Condom use during sex with a woman in the past 6 months
Always	11	4.1% [2.5%; 6.4%]	48.1%	20.5	0.021
Sometimes	9	3.4% [1.7%; 6.6%]	80.2%	42.4	<  0.0001
Never	10	5.9% [3.2%; 10.7%]	86.9%	71.4	<  0.0001
Occupation
Student	12	6.1% [4.5%; 8.4%]	59.8%	29.8	0.0029
Teacher	2	5.3% [1.1%; 22.8%]	0.0%	0.6	0.7348
Office staff	12	8.0% [6.2%; 10.2%]	76.2%	50.5	<  0.0001
Farmer	2	14.8% [3.8%; 43.2%]	93.4%	30.3	<  0.0001
Service business employee	8	8.1% [5.6%; 11.6%]	90.3%	82.7	<  0.0001
Jobless or job-seeking	9	10.3% [8.4%; 12.6%]	31.2%	13.1	0.159
Worker	8	8.6% [7.5%; 9.9%]	33.1%	12.0	0.1533
Sexual debut partner
Male	8	6.8% [4.0%; 10.1%]	95.4%	152.8	<  0.0001	0.60[0.53,0.69]
Female	8	10.2% [6.6%; 14.4%]	94.5%	127.4	<  0.0001
Drug use
Yes	7	6.4% [4.2%; 10.0%]	42.9%	10.5	0.1046	1.14[0.31,4.21]
No	7	8.2% [2.4%; 17.0%]	99.2%	770.7	<  0.0001
Quality ssessment
satisfactory	142	5.5% [4.6%; 6.6%]	96.5%	2481.5	<  0.0001	0.74[0.60, 0.92]
good	213	7.4% [6.5%;8.4%]	97.7%%	1823.0	<  0.0001

Figures in parentheses are 95% CIs; OR, odds ratio