Table 3 Association of other factors with HIV seroconversion among the INSIGHT case-control study participants
| Any report of: | Cases n = 75 | Controls n = 157 | Univariable | Multivariable* |
| % | % | OR (95% CI) | AOR (95% CI) | |
| Ancillary sexual behaviours | ||||
| Insertive oral sex | 96 | 99 | 0.15 (0.02, 1.50) | |
| Being rimmed | 96 | 88 | 3.09 (0.88, 10.83) | |
| Rimming another man | 91 | 78 | 3.09 (1.23, 7.23) | 3.28 (1.27, 8.46) |
| Group sex | 72 | 58 | 1.91 (1.04, 3.51) | |
| Sex toys: receptive | 44 | 28 | 1.95 (1.08, 3.50) | |
| Fisting another man | 32 | 23 | 1.58 (0.85, 2.95) | |
| Being fisted | 25 | 10 | 3.10 (1.46, 6.60) | 3.12 (1.40, 6.96) |
| Sexually transmitted infections | ||||
| Gonorrhoea | 27 | 9 | 3.59 (1.66, 7.77) | 4.22 (1.82, 9.74) |
| Non-specific urethritis/Chlamydia | 10 | 19 | 0.51 (0.21, 1.24) | 0.44 (0.17, 1.13) |
| Warts | 9 | 8 | 1.14 (0.41, 3.18) | |
| Syphilis | 7 | 1 | 6.01 (1.14, 31.80) | 4.85 (0.86, 27.41) |
| Pubic lice | 6 | 11 | 0.54 (0.17, 1.67) | 0.39 (0.11, 1.37) |
| Herpes | 4 | 3 | 1.72 (0.37, 7.92) | |
| Substance use | ||||
| Alcohol | 89 | 88 | 1.15 (0.48, 2.77) | |
| Nitrite inhalants (poppers) | 80 | 58 | 2.90 (1.52, 5.55) | 3.70 (1.75, 7.83) |
| MDMA (Ecstasy) | 67 | 44 | 2.55 (1.44, 4.53) | 1.71 (0.76, 3.85) |
| Cocaine | 59 | 46 | 1.63 (0.94, 2.85) | |
| Cannabis | 56 | 54 | 1.08 (0.62, 1.88) | 0.43 (0.21, 0.86) |
| Ketamine | 55 | 33 | 2.43 (1.39, 4.28) | 1.99 (0.90, 4.41) |
| Viagra | 53 | 39 | 1.80 (1.03, 3.14) | |
| Speed | 25 | 18 | 1.50 (0.78, 2.90) | |
| GHB (gamma hydroxy butyrate) | 25 | 17 | 1.63 (0.84, 3.18) | |
| Methamphetamine | 16 | 13 | 1.30 (0.60, 2.83) | |
| LSD | 15 | 6 | 2.83 (1.12, 7.15) | 3.19 (0.99, 10.21) |
| Mushrooms | 11 | 8 | 1.44 (0.56, 3.69) | 0.40 (0.12, 1.34) |
| Valium | 11 | 10 | 1.05 (0.43, 2.58) | |
| Steroids | 8 | 4 | 2.19 (0.68, 7.03) | |
| Venues used to meet men | ||||
| Bar/club | 66 | 62 | 1.23 (0.68, 2.18) | |
| Internet | 58 | 45 | 1.66 (0.95, 2.91) | 1.85 (1.02, 3.41) |
| Sauna | 53 | 45 | 1.37 (0.79, 2.39) | |
| Cruising ground | 32 | 25 | 1.47 (0.80, 2.70) | 1.77 (0.88, 3.56) |
| Backroom | 32 | 23 | 1.63 (0.88, 3.02) | 1.58 (0.80, 3.14) |
| Private party | 18 | 21 | 0.81 (0.40, 1.66) | |
| Gym | 12 | 18 | 0.65 (0.29, 1.47) | 0.49 (0.21, 1.17) |
| Chat line | 8 | 5 | 1.61 (0.54, 4.82) | |
| Toilet | 7 | 14 | 0.49 (0.17, 1.27) | 0.26 (0.08, 0.79) |
| College/work | 7 | 13 | 0.49 (0.17, 1.35) |
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*Variables in each tier were entered into a stepwise backwards logistical model retaining those where p⩽0.2.
