Characteristics and sexual behaviours at baseline for MSM with HIV infection or negative HIV test
| Variables at baseline | Total N (%) | HIV infection N (%) | HIV negative N (%) |
| Age | |||
| <45 | 1504 (74.13) | 96 (75.59) | 1408 (74.03) |
| 45–60 | 464 (22.87) | 27 (21.16) | 437 (22.98) |
| >60 | 61 (3.01) | 4 (3.15) | 57 (3.00) |
| Marital status | |||
| Married | 947 (46.67) | 70 (55.12) | 877 (46.11) |
| Unmarried | 1082 (53.33) | 57 (44.88) | 1025 (53.89) |
| Education | |||
| Below high school | 56 (2.76) | 5 (3.94) | 51 (2.68) |
| High school | 1172 (57.76) | 90 (70.87) | 1082 (56.89) |
| College or more | 801 (39.48) | 32 (25.20) | 769 (40.43) |
| Residence time in Tianjin | |||
| <3 months | 405 (19.96) | 41 (32.28) | 364 (19.14) |
| 3–7 months | 39 (1.92) | 2 (1.57) | 37 (1.74) |
| 7–12 months | 41 (2.02) | 5 (3.94) | 36 (1.89) |
| 1–2 years | 86 (4.24) | 2 (1.57) | 84 (72.61) |
| >2 years | 1458 (71.86) | 77 (60.63) | 1381 (72.61) |
| Condom use in last anal sex | |||
| Yes | 1550 (76.39) | 78 (61.42) | 1472 (77.39) |
| No | 479 (23.61) | 49 (38.58) | 430 (22.61) |
| Frequency of condom use during anal sex*† | |||
| Consistent use | 785 (38.69) | 43 (33.86) | 742 (39.01) |
| Inconsistent use | 1244 (61.31) | 84 (66.14) | 1160 (60.99) |
| Number of sexual partners† | |||
| <10 | 1709 (84.23) | 116 (91.34) | 1593 (83.75) |
| More than 10 | 320 (15.77) | 11 (8.66) | 309 (16.25) |
| STI† | |||
| Yes | 68 (3.35) | 2 (1.57) | 66 (3.47) |
| No | 1961 (96.65) | 125 (98.43) | 1836 (96.53) |
| Inject drugs† | |||
| Yes | 22 (1.08) | 2 (1.57) | 20 (1.05) |
| No | 2007 (98.92) | 125 (98.43) | 1882 (98.94) |
| Accept health service‡ | |||
| Yes | 938 (46.23) | 53 (41.73) | 885 (46.50) |
| No | 1091 (53.77) | 74 (58.27) | 1017 (53.50) |
| MSW§† | |||
| Yes | 102 (5.03) | 5 (3.94) | 97 (5.10) |
| No | 1927 (94.97) | 122 (96.06) | 1805 (94.90) |
*The frequency of condom use during anal sex in the past 6 months was divided into two categories: consistent use (when engaging in anal intercourse, condoms were used in more than 80% of cases and condoms were used throughout the sex) and inconsistent use (other cases).
†In the past 6 months.
‡Health service represented whether participants had accepted any HIV-related health service (HIV testing, condom distribution, HIV risk-reducing consult, peer education or HIV infection risk assessment) in the past 12 months.
§MSW represented the participants who have been obtaining money or goods through sexual activity.
MSM, men who have sex with men; MSW, male sex worker; STI, sexually transmitted infection.