Table 3 Univariate analysis of factors correlated with participation in group sex (n = 1151)
Variables | Participation in group sex in the prior 6 months | Lifetime participation in group sex | ||
|---|---|---|---|---|
OR(95% CI) | P value | OR(95% CI) | P value | |
Age (years) | ||||
  ≤ 25 | 1 |  | 1 |  |
 26–35 | 1.38 (0.79–2.42) | 0.262 | 2.05 (1.39–3.01) | < 0.001 |
  > 35 | 0.93 (0.45–1.93) | 0.854 | 1.21 (0.74–1.98) | 0.451 |
Residence | ||||
 Chongqing | 1 |  | 1 |  |
 Other | 0.93 (0.54–1.63) | 0.811 | 1.01 (0.70–1.47) | 0.950 |
Marital status | ||||
 Single | 1 |  | 1 |  |
 Married or cohabitating | 1.19 (0.63–2.27) | 0.588 | 1.35 (0.88–2.09) | 0.171 |
Monthly income (Yuan) | ||||
  < 3000 | 1 |  |  |  |
  ≥ 3000 | 3.85 (1.39–10.70) | 0.010 | 2.89 (1.63–5.09) | < 0.001 |
Initiating anal sex before 18 years old | ||||
 No | 1 |  | 1 |  |
 Yes | 2.63 (1.14–6.08) | 0.023 | 2.21 (1.55–3.15) | < 0.001 |
Using gay apps to seek sex partners | ||||
 No | 1 |  | 1 |  |
 Yes | 8.26 (2.98–22.88) | < 0.001 | 9.49 (4.94–18.21) | < 0.001 |
Recreational drug use in the prior 6 months | ||||
 No | 1 |  | 1 |  |
 Yes | 16.04 (9.03–28.48) | < 0.001 | 6.46 (4.54–9.19) | < 0.001 |
Condomless internal ejaculation during anal intercourse in the prior 6 months | ||||
 No | 1 |  | 1 |  |
 Yes | 4.12 (2.37–7.18) | < 0.001 | 1.64 (1.18–2.27) | 0.003 |
HIV testing in the prior 6 months | ||||
 No | 1 |  | 1 |  |
 Yes | 1.40 (0.85–2.30) | 0.187 | 0.89 (0.63–1.25) | 0.508 |
History of STIs | ||||
 No | 1 |  | 1 |  |
 Yes | 2.52 (1.19–5.31) | 0.016 | 3.70 (2.22–6.17) | < 0.001 |