Table 1 Demographic traits, history of STIs, and risky behaviors of MSM in China (N = 3,257)

Socio-demographics

Age group

5.182

0.159

≤ 22

544(16.7)

362(17.6)

182(15.1)

23–32

1505(46.2)

955(46.5)

550(45.7)

33–42

849(26.1)

516(25.1)

333(27.7)

≥ 43

359(11.0)

221(10.8)

138(11.5)

Region

5.207

0.074

Eastern

1930(59.3)

1200(58.4)

730(60.7)

Central

830(25.5)

518(25.2)

312(25.9)

Western

497(15.3)

336(16.4)

161(13.4)

Ethnic group

1.985

0.159

Han

3001(92.1)

1903(92.6)

1098(91.3)

Minority group

256(7.9)

151(7.4)

105(8.7)

Marital status

7.426

0.024*

Married

408(12.5)

277(13.5)

131(10.9)

Unmarried

2632(80.8)

1653(80.5)

979(81.4)

Divorced/widowed

217(6.7)

124(6.0)

93(7.7)

Occupation

23.248

0.002*

Farmer

148(4.5)

110(5.4)

38(3.2)

Student

618(19.0)

401(19.5)

217(18.0)

Employee of enterprise or public institution

902(27.7)

522(25.4)

380(31.6)

Worker

342(10.5)

222(10.8)

120(10.0)

Businessman

282(8.7)

190(9.3)

92(7.6)

Commercial sex worker

502(15.4)

309(15.0)

193(16.0)

Unemployed

295(9.1)

192(9.3)

103(8.6)

Other

168(5.2)

108(5.3)

60(5.0)

Educational background

54.468

< 0.001*

Illiteracy and primary school

50(1.5)

35(1.7)

15(1.2)

Junior high school

254(7.8)

202(9.8)

52(4.4)

High school/ Technical secondary school

525(16.1)

358(17.4)

167(13.9)

Junior college/ Undergraduate school

2130(65.4)

1303(63.5)

827(68.7)

Master’s or above

298(9.2)

156(7.6)

142(11.8)

Sexual identity

0.059

0.808

Gay

2619(80.4)

1649(80.3)

970(80.6)

Bisexual

638(19.6)

405(19.7)

233(19.4)

History of HIV

24.433

< 0.001*

Yes

867(26.6)

520(25.3)

347(28.8)

No

2189(67.2)

1376(67.0)

813(67.6)

Unsure

201(6.2)

158(7.7)

43(3.6)

History of syphilis

10.169

0.006*

Yes

475(14.6)

298(14.5)

177(14.7)

No

2658(81.6)

1661(80.9)

997(82.9)

Unsure

124(3.8)

95(4.6)

29(2.4)

Male partners in the past month

0.583

0.747

0

1433(44.0)

913(44.4)

520(43.2)

1–2

1569(48.2)

979(47.7)

590(49.1)

≥ 3

255(7.8)

162(7.9)

93(7.7)

Condom use

2.967

0.227

Never

146(4.5)

100(4.9)

46(3.8)

Sometimes

891(27.3)

572(27.8)

319(26.5)

Every time

2220(68.2)

1382(67.3)

838(69.7)