Table 1.

Findings from generalised linear mixed models (GLMMs)^† predicting unprotected anal intercourse (UAI) episodes using situational predictor variables

Situational variables	All episodes (n = 258), n (%)	UAI episodes (n = 124)		UAI episodes with serodiscordant or unknown status partners (n = 37)
		n (%)	OR (95% CI)	n (%)	OR (95% CI)
Drug use
Drug use by self	127 (49%)	76 (61%)	2.3 (1.1 to 4.7)*	19 (51%)	1.4 (0.6 to 3.4)
Drug use by partner†	112 (54%)	66 (66%)	2.8 (1.3 to 6.4)**	13 (50%)	1.1 (0.4 to 2.9)
Drug use by self and partner‡	102 (41%)	61 (52%)	2.4 (1.1 to 5.1)*	11 (33%)	0.9 (0.4 to 2.4)
Partner characteristics
Met partner online	72 (28%)	50 (40%)	4.3 (1.8 to 10.4)**	18 (49%)	2.9 (1.2 to 7.5)*
Partner represented physical ideal	168 (65%)	74 (60%)	0.8 (0.4 to 1.7)	19 (51%)	0.6 (0.2 to 1.4)
Feelings about partner
Strong emotional attraction	164 (64%)	71 (57%)	0.7 (0.3 to 1.4)	18 (49%)	0.8 (0.3 to 1.8)
Strong sexual attraction	230 (89%)	107 (86%)	0.8 (0.3 to 2.2)	27 (73%)	0.3 (0.1 to 0.9)*
Sexual encounter characteristics
Discussions about HIV/condom use	172 (67%)	68 (55%)	0.4 (0.2 to 0.8)**	18 (49%)	0.5 (0.2 to 1.2)
Multiple sex partners	38 (15%)	25 (20%)	2.2 (0.8 to 5.8)	5 (14%)	0.9 (0.3 to 2.9)
Sex party or bathhouse setting	15 (6%)	8 (7%)	1.6 (0.4 to 7.0)	6 (16%)	6.3 (1.0 to 26.9)**

^*p≤0.05;

^**p≤0.01, BOLD indicates situational predictor variable was significant (p≤0.05) in multivariate model;

^†all analyses were adjusted for participants’ age and race. Analyses examining drug use situational predictor variables were adjusted for participants’ drug use behaviours at baseline;

^‡excludes episodes in which participants indicated not knowing if their partner used drugs before or during the episode.