Trends in sexual behaviour among London homosexual men 1998–2003: implications for HIV prevention and sexual health promotion

Table 2

Number (%) of men reporting unprotected anal intercourse (UAI) between 1998 and 2003

	1998		1999		2000		2001		2002		2003		Odds ratio	95% CI	p Value
	No	%	No	%	No	%	No	%	No	%	No	%	Odds ratio	95% CI	p Value
Odds ratios from multivariate model.
The percentages in table 2 were derived by dividing the number of men reporting UAI by the number of men surveyed (table 1)—for example, for HIV positive men reporting non-concordant UAI with a casual partner in 1998 the percentage is 18/118 = 15.3%.
Non-concordant UAI
All non-concordant UAI	121	14.5	106	16.8	136	18.4	174	23.6	181	21.9	108	21.7	1.24	1.16–1.31	<0.001
With a casual partner
HIV positive men	18	15.3	15	14.9	23	19.2	45	38.8	50	41.3	29	37.2	1.46	1.26–1.69	<0.001
HIV negative men	33	6.8	40	10.1	49	10.7	53	12.1	65	12.0	47	14.1	1.32	1.20–1.46	<0.001
Never tested men	5	2.1	6	4.5	14	8.8	14	7.7	13	7.9	4	4.7	1.28	1.06–1.54	0.01
All men	56	6.7	61	9.7	86	11.6	112	15.2	128	15.5	80	16.1	1.36	1.26–1.46	<0.001
With main partner alone
HIV positive men	5	4.2	5	5.0	2	1.7	5	4.3	1	0.8	2	2.6	–	–	0.7
HIV negative men	29	6.0	26	6.6	25	5.4	34	7.8	32	5.9	18	5.4	–	–	0.7
Never tested men	31	13.3	14	10.5	23	14.4	23	12.7	20	12.1	8	9.3	–	–	0.7
All men	65	7.8	45	7.1	50	6.8	62	8.4	53	6.4	28	5.6	–	–	0.7
Concordant UAI
All concordant UAI	82	9.8	76	12.1	113	15.3	81	11.0	126	15.2	73	14.7	1.16	1.08–1.25	<0.001
With a casual partner
HIV positive men	8	6.8	4	4.0	17	14.2	13	11.2	11	9.1	8	10.3	1.27	1.01–1.58	0.04
HIV negative men	8	1.7	5	1.3	9	2.0	4	0.9	15	2.8	7	2.1	–	–	0.2
With main partner alone
HIV positive men	6	5.1	6	6.0	7	5.8	6	5.2	7	5.8	5	6.4	–	–	0.2
HIV negative men	60	12.4	61	15.4	80	17.4	58	13.2	93	17.2	53	15.9	1.11	1.02–1.21	0.02