| | Characteristics | Univariate analysis | Multivariate analysis | | OR (95% CI) | AOR (95% CI) |
| | Study site | | | | Guangzhou | 3.9 (2.3, 6.7) | 3.2 (1.8, 5.8) | | Hangzhou | 1.0 | 1.0 | | Changchun | 0.1 (0.01, 0.4) | 0.1 (0.01, 0.5) | | Lanzhou | 0 | 0 | | Wuhan | 2.3 (1.2, 4.2) | 3.5 (1.8, 7.0) | | Venue type | | | | Hotel | 4.8 (2.4, 9.5) | 1.1 (0.5, 2.4) | | Night clubs/KaraOK | 5.7 (3.2, 10.0) | 2.8 (1.5, 5.1) | | Saunas | 1.0 | 1.0 | | Hair salons/rental houses | 1.7 (0.8, 3.3) | 0.8 (0.4, 1.7) | | Age group (years) | | | | 16–20 | 5.1 (2.5, 10.3) | 2.4 (1.0, 6.0) | | 21–29 | 2.0 (1.0, 4.0) | 1.3 (0.6, 3.0) | | 30–48 | 1.0 | 1.0 | | Ethnicity | | | | Han | 0.8 (0.4, 1.7) | | | Minority | 1.0 | | | Marital status | | | | Never married | 4.05 (2.40, 6.83) | | | Ever married | 1.0 | | | Education level | | | | ≤primary school | 1.0 | 1.0 | | Middle school | 4.8 (1.5, 15.5) | 5.1 (1.5, 17.4) | | ≥high school | 4.9 (1.5, 16.0) | 6.8 (1.9, 23.6) | | Injected drugs in the past 12 months | | | | Yes | 11.7 (4.1, 32.7) | 24.4 (6.2, 96.8) | | No | 1.0 | 1.0 | | Had STI symptoms in the past 12 months | | | | Yes | 1.6 (1.1, 2.3) | 2.2 (1.4, 3.4) | | No | 1.0 | 1.0 | | Had STI diagnosis in the past 12 months | | | | Yes | 2.7 (1.5, 4.9) | | | No | 1.0 | |
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