Table 3.

Odds ratios estimated by logistic regression analysis in a group of 1,190 Belgian MSM

Comparison of subjects with or without AD
Variable	Bivariate analysis (95% CI)			Multivariate analysis* (95% CI)
	Odds ratio	95% CI	P	Odds ratio	95% CI	P
Age (years) (increasing continuous variable)	0.985	0.975–0.996	0.006	0.872	0.810–0.939	<0.0001
Number of sex partners (increasing continuous variable)	0.877	0.816–0.943	<0.0001
Number of sex partners at the same time (increasing continuous variable)	0.913	0.853–0.976	0.008
Age of first sexual experience with same-sex partner (increasing continuous variable)	1.014	0.995–1.034	NS
Frequency of sex with partner (decreasing variable)	0.874	0.788–0.970	0.011	0.88	0.795–0.978	0.018
Steady relationship (no/yes)	1.304	1.028–1.653	0.029
Use of poppers (no/yes)	1.226	0.962–1.562	NS
Use of condom (no/yes)	1.024	0.890–1.178	NS
Use of lubricant (no/yes)	0.603	0.374–0.972	0.038
Massage of the anal sphincter before anal sex (no/yes)	1.175	1.026–1.345	0.02

^*In the multivariate analysis, both forward and backward stepwise logistic regression analysis was performed, with identical results

MSM = men who have sex with men; AD = anodyspareunia; CI = confidence interval; NS = not significant