Table 3

Factors associated with unprotected anal intercourse with casual partners in the previous 12 months: n, row %, unadjusted and multivariate logistic regression (n=639)

	Yes, n (%)	OR	95% CI	p Value	AOR*	95% CI	p Value
Overall	337 (52.7)
Survey location
Edinburgh	126 (46.3)	1			1
Glasgow	211 (57.5)	1.57	1.14 to 2.15	0.005	1.48	1.05 to 2.11	0.028
Sexual orientation
Gay	311 (51.7)	1			1
Bisexual	25 (73.5)	2.60	1.19 to 5.66	0.016	2.17	0.94 to 5.02	0.071
Age
16 to 25	146 (62.9)	1		0.001	1		0.036
26–35	105 (47.7)	0.54	0.37 to 0.78		0.62	0.41 to 0.94
36–45	57 (46.0)	0.50	0.32 to 0.78		0.58	0.35 to 0.96
45+	28 (45.2)	0.49	0.28 to 0.86		0.47	0.24 to 0.89
Area of residence†
Elsewhere	69 (47.6)	1			1
Glasgow/Edinburgh	256 (54.0)	1.29	0.89 to 1.88	0.176	1.09	0.72 to 1.66	0.681
Employment
Employed	266 (51.9)	1
Other	71 (56.3)	1.20	0.81 to 1.78	0.365
Education
Secondary	52 (54.7)	1.61	1.01 to 2.58		1.42	0.85 to 2.36
Further/vocational	142 (61.5)	2.13	1.49 to 3.04		1.90	1.29 to 2.81
Degree/postgraduate	117 (42.9)	1		<0.001	1		0.009
Frequency of gay scene use
Once a month or less	71 (41.3)	1		<0.001	1		0.001
2–3 times a month	74 (47.1)	1.27	0.82 to 1.96		1.20	0.74 to 1.93
Once or more a week	192 (61.9)	2.32	1.58 to 3.39		2.12	1.38 to 3.26
HIV treatment optimism 1‡
Agree	103 (44.4)	1			1
Uncertain/disagree	227 (57.3)	0.64	0.43 to 0.96	0.029	0.81	0.51 to 1.30	0.382
HIV treatment optimism 2‡
Agree	78 (60.9)	1			1
Uncertain/disagree	246 (50.1)	0.61	0.38 to 0.99	0.045	0.52	0.30 to 0.92	0.026
Had either an HIV or STI test in previous 12 months
No	52 (62.7)	1			1
Yes	272 (50.7)	1.68	1.21 to 2.33	0.002	1.56	1.09 to 2.23	0.016
HIV status (from saliva test)
HIV–	286 (54.6)	1		0.044	1		0.168
HIV+	14 (58.3)	1.17	0.51 to 2.67		0.84	0.34 to 2.09
Did not provide oral fluid specimen	37 (40.7)	0.57	0.36 to 0.90		0.62	0.38 to 1.02
Drunk on alcohol
Never	63 (44.4)	1			1
Always/sometimes	274 (55.1)	1.54	1.06 to 2.24	0.024	1.19	0.78 to 1.83	0.423
Used poppers
Never	201 (49.4)	1			1
Always/sometimes	136 (58.6)	1.45	1.05 to 2.01	0.025	1.50	1.03 to 2.17	0.034
Used stimulant or recreational/illicit drugs
Never	248 (49.9)	1			1
Always/sometimes	89 (62.7)	1.69	1.15 to 2.47	0.007	1.21	0.77 to 1.90	0.421
Used Viagra§
Never	283 (51.5)	1			1
Always/sometimes	54 (60.0)	1.41	0.90 to 2.22	0.138	1.50	0.86 to 2.60	0.150

*Adjusted for survey location, sexual orientation, age, area of residence, employment, education, frequency of gay scene use, HIV treatment optimism 1+2, HIV/STI testing, HIV status, alcohol, popper, stimulant or recreational/illicit drug and Viagra use.
†Area of residence—Associated with always or sometimes using alcohol during UAI in the previous 12 months (see table 1).
‡HIV treatment optimism 1—‘I am less worried about HIV infection now that treatments have improved’, HIV treatment optimism 2—‘I believe that new drug therapies make people with HIV less infectious’.
§Used Viagra—All alcohol and drug use variables were included in the logistic regression models because of significant correlations found between them.