Table 2.

Predictors of chlamydia in young heterosexual male backpackers and non-backpackers

	Young male heterosexual backpackers, n=2765				Young male heterosexual non-backpackers, n=3880
	Univariate		Multivariate		Univariate		Multivariate
	OR (95% CI)	p Value	OR (95% CI)	p Value	OR (95% CI)	p Value	OR (95% CI)	p Value
Age group (years)
26–30	1	0.375	–		1		1
≤25 years	1.12 (0.87 to 1.46)				1.40 (1.09 to 1.81)	0.009	1.46 (1.12 to 1.89)	0.005
Marital status
Other	1	0.264	–		1		–
Never married	1.45 (0.75 to 2.80)				1.37 (0.92 to 2.04)	0.118
Current cigarette smoker
No	1	0.346	–		1		–
Yes	1.13 (0.88 to 1.47)				1.53 (1.18 to 1.97)	0.001
Excess alcohol*
No	1	0.063	–		1		1
Yes	1.35 (0.98 to 1.85)				2.03 (1.31 to 3.15)	0.002	1.65 (1.04 to 2.61)	0.033
Reason for presentation
Other reasons	1		1		1		1
STI/ HIV test	0.95 (0.68 to 1.32)	0.760	0.91 (0.64 to 1.28)	0.579	0.67 (0.48 to 0.92)	0.014	0.62 (0.44 to 0.86)	0.005
Ano-genital symptoms	1.03 (0.74 to 1.43)	0.854	0.95 (0.68 to 1.33)	0.763	0.99 (0.73 to 1.33)	0.923	0.93 (0.68 to 1.26)	0.635
Known STI contact	3.10 (1.92 to 4.93)	<0.001	2.95 (1.82 to 4.77)	<0.001	3.24 (2.16 to 4.87)	<0.001	3.69 (2.42 to 5.65)	<0.001
Number of sex partners (past 3 months)
0 or 1	1		1		1		1
2	1.81 (1.31 to 2.51)	<0.001	1.69 (1.22 to 2.35)	0.002	2.09 (1.53 to 2.85)	<0.001	2.11 (1.53 to 2.91)	<0.001
3 or more	2.21 (1.63 to 3.00)	<0.001	2.06 (1.22 to 2.35)	<0.001	3.18 (2.34 to 4.31)	<0.001	3.03 (2.20 to 4.18)	<0.001
Consistent condom use (past 3 months)
Yes	1	<0.001	1		1		1
No	3.17 (2.20 to 4.57)		2.71 (1.87 to 3.93)	<0.001	2.37 (1.70 to 3.31)	<0.001	1.94 (1.38 to 2.74)	<0.001
Past chlamydia diagnosis
No	1	0.500	–		1
Yes	1.13 (0.80 to 1.59)				1.73 (1.21 to 2.48)	0.003	1.50 (1.03 to 2.18)	0.034

^*Average alcohol intake of 280 g for men and 140 g for women.

STI, sexually transmissible infection.