Person years no. of seroconverters Incidence per person year, % Adjusted IRR* 95%CI   p value
Transactional sex with main partner during follow up              
none 1750 102 5.8 1.00      
any 269 25 9.3 1.44 0.92 2.24 0.111
Transactional sex with a once off partner during follow up              
none 2016 124 6.1 1.00      
any 13 3 23.7 3.29 1.02 10.55 0.046
Transactional sex with an on-going or casual partner during follow up              
none 1919 110 5.7 1.00      
any 117 17 14.5 2.06 1.22 3.48 0.007
2+ partners during follow up              
none 1243.0 61 4.9 1.00      
any 793.0 66 8.3 1.37 0.96 1.98 0.086
Partner 5+ years older during follow up**              
none 660.0 54 8.2 1.00      
any 1376.0 73 5.3 0.73 0.50 1.05 0.085
Transactional sex and multiple partners during follow up : neither 1241.0 61 4.9 1.00      
2+ partners, no transactional sex with a casual partner 678.0 49 7.2 1.20 0.81 1.77 0.368
Transactional sex with a casual partner and 2+ partners 117.0 17 14.5 2.23 1.28 3.88 0.005
** additionally adjusted for having transactional sex with a casual partner
* Poisson models adjusted for age, HSV2, relationship power, condom use, IPV exposure, treatment, stratum and person years of exposure

Table 3: Incidence and relative incidence of HIV infection in a cohort of women exposed to transactional sex and other risky practices.
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