Table 4

 Predictors of HIV positivity*

City of recruitmentInteraction
LondonBrightonManchesterχ2 (2 df)p Value
Adj, adjusted; df, degrees of freedom; GUM, genitourinary medicine; STI, sexually transmitted infection; UAI, unprotected anal intercourse; unadj, unadjusted.
*Adjusted OR adjusting for age, education, ethnicity and employment status.
†Using Kruskal–Wallis test.
Median age (years)3636342.660.27†
Unemployed
    Unadj OR (95% CI)2.64 (1.76 to 3.96)4.01 (2.14 to 7.47)1.84 (0.71 to 4.80)2.070.36
    Adj OR (95% CI)2.50 (1.66 to 3.79)4.09 (2.12 to 7.87)1.58 (0.58 to 4.37)1.430.49
Educated after the age of 16 years
    Unadj OR (95% CI)0.56 (0.37 to 0.86)0.67 (0.35 to 1.29)0.45 (0.20 to 1.04)0.530.77
    Adj OR (95% CI)0.58 (0.37 to 0.88)0.73 (0.37 to 1.44)0.65 (0.26 to 1.63)0.450.80
Attended GUM clinic in the last year
    Unadj OR (95% CI)3.34 (2.40 to 4.65)5.50 (2.72 to 11.15)3.04 (1.35 to 6.85)1.750.41
    Adj OR (95% CI)3.43 (2.44 to 4.81)6.81 (3.12 to 14.87)3.07 (1.33 to 7.06)3.590.16
STI in the last year
    Unadj OR (95% CI)2.64 (1.89 to 3.68)3.44 (1.88 to 6.32)2.01 (0.92 to 4.43)1.160.56
    Adj OR (95% CI)2.64 (1.87 to 3.72)3.54 (1.87 to 6.72)2.25 (0.99 to 5.06)1.390.50
UAI with >1 partner in the last year
    Unadj OR (95% CI)2.89 (2.03 to 4.11)2.95 (1.57 to 5.54)1.80 (0.80 to 4.04)1.180.56
    Adj OR (95% CI)2.89 (2.01 to 4.17)2.71 (1.39 to 5.30)2.02 (0.88 to 4.67)0.750.69
UAI with casual partners in the last year
    Unadj OR (95% CI)2.06 (1.45 to 2.94)2.19 (1.15 to 4.19)1.91 (0.84 to 4.33)0.070.97
    Adj OR (95% CI)2.04 (1.42 to 2.94)2.44 (1.22 to 4.85)1.99 (0.86 to 4.61)0.630.73
UAI with partners of an unknown or discordant HIV status in the last year
    Unadj OR (95% CI)1.49 (1.01 to 2.18)1.64 (0.85 to 3.18)1.30 (0.54 to 3.11)0.180.91
    Adj OR (95% CI)1.58 (1.06 to 2.34)1.76 (0.87 to 3.58)1.43 (0.58 to 3.49)0.390.82