Table 2 Chi square analysis of frequency of behaviour and predicted group membership on the basis of discriminant analysis. Df = 1 in all cases. Rows in bold are significant at P < 0.05.
Behaviour | Chi square value | P | Percentage of predicted uninfected exhibiting behaviour (n = 53) | Percentage of predicted syphilis infected group exhibiting behaviour (n = 32) |
|---|---|---|---|---|
Paying for sex | 0.027 | 0.870 | 11.3 | 12.5 |
Using condom during anal sex | 1.637 | 0.201 | 45.3 | 31.3 |
Using cocaine | 5.647 | 0.017 | 30.2 | 56.3 |
Using poppers | 6.064 | 0.014 | 71.7 | 93.8 |
Using alcohol | 2.495 | 0.114 | 98.1 | 90.6 |
Using amphetamines | 6.574 | 0.010 | 34.0 | 62.5 |
Using ecstasy | 5.930 | 0.015 | 41.5 | 68.8 |
Using Viagra | 11.715 | 0.001 | 7.5 | 37.5 |
Using GHB | 18.827 | <0.001 | 18.9 | 65.6 |
Meeting partners in pubs | 0.096 | 0.756 | 86.8 | 84.4 |
Meeting partners in clubs | 2.315 | 0.128 | 73.6 | 87.5 |
Meeting partners in saunas | 0.960 | 0.327 | 45.3 | 56.3 |
Meeting through cruising | 13.443 | <0.001 | 34.0 | 75.0 |
Meeting through cottaging | 17.805 | <0.001 | 13.2 | 56.3 |
Meeting in dark rooms | 11.384 | 0.001 | 28.3 | 65.6 |
Meeting through chat rooms | 3.355 | 0.067 | 17.0 | 34.4 |
Meeting on the internet | 0.113 | 0.737 | 18.9 | 21.9 |
Meeting partners abroad | 18.093 | <0.001 | 5.7 | 43.8 |
Meeting partners in Manchester | 3.732 | 0.053 | 9.4 | 25.0 |