Table 2

Multivariate logistic regression: ORs and 95% CIs for HIV infection

		Univariate analysis		Multivariate analysis
	Prevalence (%)	OR (95% CI)	p Value	OR (95% CI)	p Value
Age (years)
<25	41	1		1
25–29	21	1.98 (1.66 to 2.38)	<0.001	1.52 (1.23 to 1.87)	<0.001
30–34	16	1.60 (1.32 to 1.95)	<0.001	1.19 (0.94 to 1.50)	0.142
35+		0.70 (0.58 to 0.85)	<0.001	0.50 (0.40 to 0.63)	<0.001
Age at first sex (years)
<15 (1st quintile)	20	1.87 (1.47 to 2.36)	<0.001	1.96 (1.53 to 2.51)	<0.001
15–16 (2nd quintile)	20	1.50 (1.17 to 1.90)	0.001	1.61 (1.25 to 2.08)	<0.001
17–18 years (3rd quintile)	20	1.41 (1.13 to 1.76)	0.002	1.49 (1.19 to 1.87)	0.001
19–20 (4th quintile)	20	1.16 (0.87 to 1.54)	0.316	1.18 (0.89 to 1.59)	0.251
21+ (5th Quintile)	20	1		1
At least high school education
Yes	26	1		1
No	74	1.21 (1.04 to 1.41)	0.010	1.37 (1.15 to 1.62)	<0.001
English spoken at home
Yes	5	1		–
No	95	1.91 (1.53 to 2.39)	<0.001	–
Religion
Other	9	1
Christian	91	1.34 (1.06 to 1.71)	0.015	–
Number of lifetime sex partners
One	25	1		1
Two	28	2.49 (2.01 to 3.10)	<0.001	1.73 (1.37 to 2.20)	<0.001
Three	21	4.35 (3.47 to 5.44)	<0.001	2.82 (2.20 to 3.62)	<0.001
Four or more	26	6.65 (5.35 to 8.26)	<0.001	4.09 (3.20 to 5.22)	<0.001
Cohabitation status
Married/living with/a sexual partner	15	1		1
Not married/not living with/a sexual partner	85	7.02 (5.20 to 9.47)	<0.001	4.32 (3.11 to 6.00)	<0.001
Have you ever had vaginal sex with condom?
No	30	1
Yes	70	1.40 (1.21 to 1.63)	<0.001	–
Using any contraception^*
Yes	78	1
No	22	1.36 (1.16 to 1.60)	<0.001	–
HSV diagnosis
No	27	1		1
Yes	73	7.20 (5.88 to 8.82)	<0.001	6.19 (4.98 to 7.70)	<0.001
STI diagnosis^†
No	84	1		1
Yes	16	1.34 (1.12 to 1.61)	0.001	1.24 (1.02 to 1.51)	0.038

↵* Any of the following: male condom, female condom, pills, injectables, spermicides, withdrawal, long term (partner vasectomy, tubal ligation), other.
↵† Chlamydia, gonorrhoea, syphilis or Trichomonas vaginalis.
HSV, herpes simplex virus; STI, sexually transmitted infection.