Table 2.

Results for generalized linear mixed model, comparing versatile anal sex events with insertive and receptive anal sex events. Significant variables (p<.05) in bold. (OR=Odds Ratio, OR=Adjusted Odds Ratios, Not Selected = Not selected by AIC, EL=Event-level Variable)

VARIABLE	Non-Versatile		Versatile		Univariate		Multivariate
	MD	Q1-Q3	MD	Q1-Q3	OR	95% CI	aOR	95% CI
CONTINUOUS VARIABLES
Age (per 10 year increase)	35	28–48	33	26–47	0.88	0.79–0.98	0.85	0.75–0.95
Sexual Sensation Scale	32	29–35	32	30–35	1.04	1.01–1.08	Not Selected3
Treatment Optimism Scale	27	24–32	27	24–31	0.99	0.97–1.01
Months Since 1st Sex (EL) per 12 months increase	5	1–22	7	2–29	1.0	1.00–1.00	Not Selected
Months Since Most Recent Sex (EL) per 12 months increase	1	0–2	1	0–2	0.87	0.74–1.02	0.92	0.83–1.02
CATEGORICAL VARIABLES
	Non-Versatile		Versatile		Univariate		Multivariate
	N	%	N	%	OR	95% CI	aOR	95% CI
Ethnicity
White	4395	76.3	976	76.3	Ref.
Asian	594	10.3	113	8.8	0.78	0.51–1.20
Indigenous	255	4.4	49	3.8	0.62	0.34–1.16
Latino/Other	513	8.9	141	11.1	1.29	0.87–1.93
Education
≤ high school	801	14.0	179	14.1	Ref.
> high school	4925	86.0	1089	85.9	0.96	0.68–1.37
HIV Sero-status
HIV negative	3997	69.4	891	69.7	Ref.
HIV positive	1760	30.6	388	30.3	1.00	0.74–1.36
Annual Income
<$30,000	2871	49.9	675	52.9	Ref.		Ref.
$30,000-$59,999	1915	33.3	399	31.3	0.78	0.63–0.95	0.82	0.66–1.01
≥$60,000	964	16.8	203	15.8	0.93	0.68–1.27	1.03	0.76–1.41
Neighborhood
Downtown Core	2963	51.5	605	47.3	Ref.		Ref.
Vancouver	1625	28.2	428	33.5	1.28	1.02–1.57	1.32	1.04–1.67
Greater	1169	20.3	246	19.2	0.97	0.72 1.31	1.05	0.79–1.39
Vancouver
Sexual Orientation
Gay	5078	88.2	1134	88.7	Ref.
Bisexual	305	5.3	69	5.4	1.07	0.67–1.68
Other	374	6.5	76	5.9	1.04	0.70–1.55
Married
Yes (includes common law)	1111	19.3	241	18.8	Ref.		Ref,
No	1130	19.6	303	23.7	1.30	1.00–1.70	1.34	1.01–1.78
No Regular Partner	3516	61.1	735	57.5	1.13	0.87–1.47	1.20	0.92–1.57
Relationship
Monogamous	918	16.0	252	19.9	Ref.		Not included-collinear with Married variable
Open	1318	22.9	289	22.6	0.78	0.60–1.01
No Regular Partner	3516	61.1	735	57.5	0.83	0.65–1.05
Attended Sex Party
No	4110	71.4	919	71.9	Ref.
Yes	1647	28.6	360	28.1	0.92	0.76–1.11
Worked as Escort
No	5437	94.4	1183	92.5	Ref.
Yes	320	5.6	96	7.5	1.27	0.84–1.91
AUDIT Scores
Low risk 0–7	3673	64.4	798	62.8	Ref.
Hazardous 8–15	1430	25.1	355	26.4	1.00	0.80–1.26
Harmful 16–19	281	4.9	60	4.7	0.87	0.63–1.18
Dependence ≥20	324	5.6	78	6.1	0.90	0.59–1.36
Used PrEP P6M
No	3397	62.0	749	61.2	Ref.
Yes	88	1.6	17	1.4	0.85	0.41–1.77
Never heard of PrEP	1990	36.4	457	37.4	1.04	0.85–1.28
Alcohol (EL)4
No	3716	64.6	765	59.8	Ref.
Yes	2041	33.4	514	40.2	1.14	0.97–1.34
Cannabis (EL)
No	4229	73.5	848	66.3	Ref.		Ref.
Yes	1528	26.5	431	33.7	1.60	1.30–1.96	1.43	1.16–1.76
Poppers (EL)
No	4418	76.7	933	73.0	Ref.		Not Selected
Yes	1339	23.3	346	27.0	1.25	1.03–1.53
Erectile Dysfunction Drugs (EL)
No	4986	86.6	1002	78.3	Ref.		Ref.
Yes	771	13.4	277	21.7	2.03	1.59–2.59	1.90	1.43–2.52
GHB (EL)
No	5481	95.2	1161	90.8	Ref.		Ref.
Yes	276	4.8	118	9.2	1.90	1.41–2.56	1.43	1.02–2.00
Ecstasy/MDMA (EL)
No	5567	96.7	1198	93.7	Ref.		Not selected
Yes	190	3.3	81	6.3	1.78	1.17–2.71
Crystal Meth (EL)
No	5168	89.8	1099	85.9	Ref.		Not selected
Yes	589	10.2	180	14.1	1.48	1.12–1.95
First Meet (EL)
On-Line	3231	56.2	647	50.6	Ref.		Ref.
Other	2519	43.8	631	49.4	1.14	0.96–1.36	1.14	0.96–1.35
Transactional Sex (EL)
No money/goods exchanged	5531	96.1	1230	96.2	Ref.
Money/goods given	77	1.3	13	1.0	0.75	0.37–1.51
Money/goods received	132	2.3	32	2.5	1.03	0.61–1.72
Money/goods received and given	16	0.3	4	0.3	1.03	0.29–3.62
Others Involved (EL)
Dyad	5052	87.8	1091	85.3	Ref.
Threesome	518	9.0	128	10.0	0.99	0.74–1.33
Foursome	92	1.6	35	2.7	1.35	0.84–2.16
Orgy	94	1.6	25	2.0	1.16	0.66–2.01
Anal Sex Preference (EL)
Bottom	2218	38.5	379	29.6	Ref.		Ref.
Versatile	1337	23.2	565	44.2	2.22	1.77–2.78	2.23	1.77–2.81
Top	2160	37.5	331	25.9	0.91	0.71–1.16	0.93	0.72–1.20
No Anal Sex	42	0.8	4	0.3	0.56	0.21–1.54	0.71	0.21–2.38
Condom Use (EL)
0=NEVER	3106	54.0	744	58.2	Ref.		Ref.
1=ALWAYS	2395	41.6	315	24.6	0.47	0.38–0.60	0.50	0.39–0.62
3=SOMETIMES	256	4.4	220	17.2	3.91	2.93–5.21	3.72	2.79–4.97