Table 3. Multivariate Logistic Regressions of Unprotected Receptive Anal Intercourse on Partner Type, Sex Location, Serodiscordance, Group Sex, and Substance Use During Sex (N = 912; 2,316 Sexual Encounters).

		MSM (N = 371)		MSM/W (N = 286)		TW (N = 255)
		AOR	95% CI	AOR	95% CI	AOR	95% CI
Partner Type
	Main	Ref Cat		Ref Cat		Ref Cat
	Casual	0.29***	0.17-0.48	0.47**	0.29-0.76	0.33**	0.15-0.72
	Anonymous	0.30***	0.17-0.51	0.47**	0.27-0.84	0.38†	0.14-1.08
	Exchange	0.09***	0.03-0.25	0.42**	0.21-0.83	0.15***	0.07-0.31
Sex Location
	Private	Ref Cat		Ref Cat		Ref Cat
	Public	1.30	0.79-2.14	0.77	0.49-1.22	1.39	0.66-2.92
	Commercial Venue	0.63†	0.36-1.10	0.63	0.21-1.87	2.47	0.26-23.66
Serodiscordance		0.75	0.50-1.13	0.94	0.63-1.39	0.58†	0.32-1.06
Group Sex		3.6***	1.96-6.63	1.71†	0.92-3.20	3.39**	1.43-8.07
Substance Use During Sex
	Alcohol	1.17	0.78-1.76	1.36	0.89-2.08	0.83	0.38-1.82
	Methamphetamine	2.55***	1.71-3.81	0.99	0.63-1.56	1.46	0.70-3.04
	Amyl Nitrate	2.38*	1.05-5.42	4.62*	1.08-19.71	∼	∼
	Heroin	3.21†	0.77-13.36	1.29	0.34-4.82	∼	∼
	GHB	2.60†	0.92-7.38	2.15	0.35-13.29	∼	∼
	Cocaine	0.67	0.10-4.52	1.29	0.49-3.36	1.07	0.07-17.46
	Crack	3.40***	1.60-7.21	0.70	0.36-1.34	1.57	0.15-16.89
	Model Fit Statistics	p > χ2 = .000	Pseudo R2 = .144	p > χ2 = .017	Pseudo R2 = .054	p > χ2 = .000	Pseudo R2 = .152

^†p ≤ .1;

^*p ≤ .05;

^**p ≤ .01;

^***p ≤ .001

^∼Variable dropped due to absence of substance use in target population.

Statistical Control: Race/Ethnicity