Table 3

 Mantel-Haenszel odds ratios of HIV infection by various behavioural and biological characteristics. (All odds ratios are for “yes” on the variable in question, with “no”  = 1, unless otherwise stated)

Waria (n = 241) OR (95% CI, p value)MSW (n = 249*) OR (95% CI, p value)MSM (n = 279) OR (95% CI, p value)All* OR (95% CI, p value)
*One MSW had indeterminate western blot results and was dropped from analysis.
†For MSW and MSM, time reference period is 1 month. For waria, time reference period is 1 week for clients and 1 month for other male partner types. It is not possible to calculate a total for all groups.
‡Defined for sex worker groups as knowing condoms prevent HIV and healthy looking people can be infected, and for MSM as knowing condoms, abstinence or mutual monogamy can prevent against HIV and healthy looking people can be infected.
¶Waria: last week.
NR, not recorded; NC, no cases. There were no positive cases among the baseline group, so it is not possible to calculate an odds ratio.
§RPR results were missing for 2 waria and 1 MSW.
Length of time in sex work
1 year or less111
2–4 years1.4 (0.3 to 7.4, p = 0.7)1.8 (0.4 to 7.6, p = 0.5)2.3 (0.8 to 6.5, p = 0.13)
5–9 years2.6 (0.5 to 12.4, p = 0.2)0.85 (0.1 to 8.4, p = 0.9)4.8 (1.7 to 13.3, p = 0.003)
10 years or more2.1 (0.4 to 10.1, p = 0.3)5.5 (1.2 to 14.9, p = 0.001)
Total number of recent anal partners†
00.55 (0.2 to 1.8, p = 0.3)00.75 (0.1 to 4.6, p = 0.8)
1111
2–41.4 (0.5 to 3.9, p = 0.5)1.7 (0.2 to 15.6, p = 0.7)0.82 (0.8 to 8.0, p = 0.9)
5–91.4 (0.4 to 3.1, p = 0.9)0.6 (0.4 to 9.9, p = 0.7)0
10 or more1.3 (0.3 to 5.1, p = 0.7)1.8 (0.2 to 18.0, p = 0.6)12.8 (1.0 to 161.5 p = 0.05)
Sufficient knowledge to protect against HIV‡1.04 (0.52 to 2.07, p = 0.92)0.58 (0.11 to 3.07, p = 0.51)0.76 (0.15 to 3.82, p = 0.74)0.93 (0.52 to 1.69, p = 0.82)
Any unprotected anal sex with client last month¶3.21 (1.53 to 6.75, p = 0.001)1.90 (0.38 to 9.39, p = 0.42)2.93 (1.50 to 5.73, p = 0.001)
Any unprotected anal sex with a non-paying partner last month1.62 (0.86 to 3.06, p = 0.13)5.11 (1.29 to 20.19, p = 0.01)2.22 (0.42 to 11.71, p = 0.33)1.98 (1.16 to 3.38, p = 0.01)
Unprotected anal sex with any male partner last month3.43 (1.50 to 7.84, p = 0.002)NC 0.042.19 (0.42 to 11.54, p = 0.34)3.73 (1.78 to 7.79, p = 0.0002)
Any unprotected sex with a female last month0.24 (0.03 to 1.95, p = 0.14)1.72 (0.20 to 15.0, p = 0.62)0.48 (0.12 to 1.96, p = 0.16)
Heterosexual (only has sex with men for money)0.25 (0.06 to 1.05, p = 0.04)
Syphilis seroreactive (RPR ⩾1:1 and <16, TPA+)§1.27 (0.65 to 2.46, p = 0.48)0 (p = 0.72)0 (p = 0.7)3.16 (1.66 to 6.02, p = 0.0002)
Syphilis seroreactive (RPR ⩾ = 1:16, TPA+)§3.73 (1.82 to 7.64, p = 0.0001)0 (p = 0.66)22.50 (1.68 to 300.8, p = 0.0006)3.76 (1.90–7.46, p = <0.0001)