Table 1

Comparison of case and control group behaviour over 12 month periods

CasesControls
FactorA Syphilis onlyB Syphilis and HIVC HIV onlyD No infectionCases versus controls p
Summaries of continuous variables are presented as median values while percentages are used to summarise dichotomous data. Superscripts a, b and c are used to identify groups differing significantly (p<0.05) from syphilis only, syphilis and HIV and HIV only groups respectively. An overall statistical comparison between all cases and all controls is given in the final column and uses a multifactor extension of Kruskal-Wallis or stratified κ2 tests to control for confounding relations with HIV status.
Number 16 7 13 49
Medians
Age 30.5 30.0 30.0 31.00.518
Number of sexual partners 30.0 30.0 25.0 5.0a,b,c0.022
Number of new partners 23.0 30.0 20.0 5.0a,b,c0.033
Number of anal sex partners 4.0 15.0 16.0 3.0b,c0.752
Number of oral sex partners 30.0 30.0 10.0 5.0a,b0.003
% of sex partners anonymous 89.2 91.7 70.050.0a,b0.002
% of sex partners of known HIV status 0.0 8.0a 10.0a16.7a0.011
Percentages
Had anal sex without a condom 75.0 71.4 61.554.20.12
Never use condoms for oral sex100.0 85.7 92.389.60.323
Always request condom for anal sex 18.8 0.0 46.2b46.9a,b0.005
Had partner refuse condom for anal sex 18.8 42.9 61.5a18.8c0.639
Use darkrooms to find partners 68.8 42.9 61.528.6a,c0.045
Go cottaging to find partners 43.8 14.3 61.5b18.4a,c0.619
Go cruising to find partners 71.4 68.8 61.536.7a0.031
Use saunas to find partners 37.5 14.3 69.2b53.10.032
Go abroad to find partners 37.5 28.6 46.2 6.1a,c0.061
Used GHB (gamma hydroxybutyrate) 56.3 71.4 61.518.4a,b,c0.007
Used amphetamine 56.3 57.1 61.534.70.229
Used poppers (amyl nitrate) 93.8100.0100.067.3a,c0.037
Used cocaine 56.3 28.6 46.234.70.367