Table 3 Association of other factors with HIV seroconversion among the INSIGHT case-control study participants
Any report of:Cases n = 75Controls n = 157UnivariableMultivariable*
%%OR (95% CI)AOR (95% CI)
Ancillary sexual behaviours
    Insertive oral sex96990.15 (0.02, 1.50)
    Being rimmed96883.09 (0.88, 10.83)
    Rimming another man91783.09 (1.23, 7.23)3.28 (1.27, 8.46)
    Group sex72581.91 (1.04, 3.51)
    Sex toys: receptive44281.95 (1.08, 3.50)
    Fisting another man32231.58 (0.85, 2.95)
    Being fisted25103.10 (1.46, 6.60)3.12 (1.40, 6.96)
Sexually transmitted infections
    Gonorrhoea2793.59 (1.66, 7.77)4.22 (1.82, 9.74)
    Non-specific urethritis/Chlamydia10190.51 (0.21, 1.24)0.44 (0.17, 1.13)
    Warts981.14 (0.41, 3.18)
    Syphilis716.01 (1.14, 31.80)4.85 (0.86, 27.41)
    Pubic lice6110.54 (0.17, 1.67)0.39 (0.11, 1.37)
    Herpes431.72 (0.37, 7.92)
Substance use
    Alcohol89881.15 (0.48, 2.77)
    Nitrite inhalants (poppers)80582.90 (1.52, 5.55)3.70 (1.75, 7.83)
    MDMA (Ecstasy)67442.55 (1.44, 4.53)1.71 (0.76, 3.85)
    Cocaine59461.63 (0.94, 2.85)
    Cannabis56541.08 (0.62, 1.88)0.43 (0.21, 0.86)
    Ketamine55332.43 (1.39, 4.28)1.99 (0.90, 4.41)
    Viagra53391.80 (1.03, 3.14)
    Speed25181.50 (0.78, 2.90)
    GHB (gamma hydroxy butyrate)25171.63 (0.84, 3.18)
    Methamphetamine16131.30 (0.60, 2.83)
    LSD1562.83 (1.12, 7.15)3.19 (0.99, 10.21)
    Mushrooms1181.44 (0.56, 3.69)0.40 (0.12, 1.34)
    Valium11101.05 (0.43, 2.58)
    Steroids842.19 (0.68, 7.03)
Venues used to meet men
    Bar/club66621.23 (0.68, 2.18)
    Internet58451.66 (0.95, 2.91)1.85 (1.02, 3.41)
    Sauna53451.37 (0.79, 2.39)
    Cruising ground32251.47 (0.80, 2.70)1.77 (0.88, 3.56)
    Backroom32231.63 (0.88, 3.02)1.58 (0.80, 3.14)
    Private party18210.81 (0.40, 1.66)
    Gym12180.65 (0.29, 1.47)0.49 (0.21, 1.17)
    Chat line851.61 (0.54, 4.82)
    Toilet7140.49 (0.17, 1.27)0.26 (0.08, 0.79)
    College/work7130.49 (0.17, 1.35)
  • *Variables in each tier were entered into a stepwise backwards logistical model retaining those where p⩽0.2.