TABLE 1.

Univariate and Multivariate Logistic Regression Analysis of Factors Associated With HIV Infection

			Univariate Analysis		Multivariate Analysis
Variables	Cases (N = 112), %	Controls (N = 214), %	Unadjusted OR	95% CI	Adjusted OR*	95% CI
Injection, mo
0–6	88.4	28.0	19.5†	10.2 to 37.5	4.9	2.2 to 10.8
7–12	68.8	28.0	5.65†	3.4 to 9.3
13–36	73.2	42.5	3.7†	2.2 to 6.1	2.2	1.1 to 4.3
Intravenous infusion
0–6	67.0	13.6	12.9†	6.7 to 25.1	4.3	2.1 to 8.9
7–12	49.1	13.1	6.4†	3.7 to 11.0	2.9	1.4 to 6.3
13–36	47.3	29.4	2.2†	1.3 to 3.5
Blood draw
0–6	83.9	44.4	6.5†	3.7 to 11.6	5.6	2.5 to 12.2
7–12	28.6	13.1	2.7†	1.5 to 4.7
13–36	21.4	22.0	1.0	0.6 to 1.7
Minor surgery
0–6	1.8	3.7	0.5	0.1 to 2.2
7–12	2.7	1.9	1.4	0.3 to 6.6
13–36	3.6	5.6	0.6	0.2 to 2.0
Major surgery
0–6	2.7	0	NA	NA
7–12	1.8	0.9	1.9	0.5 to 13.9
13–36	2.7	1.9	1.4	0.6 to 6.6
Dental
0–6	5.3	7.0	0.8	0.3 to 2.0
7–12	3.6	4.7	0.8	0.2 to 2.5
13–36	6.3	15.9	0.4†	0.2 to 0.8	0.2	0.1 to 0.6
Obstetrics‡
0–6	11.7	5.0	2.5	0.8 to 8.3
7–12	10.0	3.0	3.6	0.8 to 14.9
13–36	10.0	8.0	1.3	0.4 to 3.9
Tattoo/skin piercing
0–6	0.9	3.3	0.3	0.1 to 2.2
7–12	0.9	1.4	0.6	0.1 to 6.2
13–36	1.8	3.7	0.3	0.1 to 2.2
Ever had sex with a sex worker§
Yes	3.5	18.8	0.2	0.1 to 1.2

^*Adjusted for age, sex and all variables in the model, only significant associations shown.

^†Statistically significant at P < 0.05.

^‡N =194 (female respondents only).

^§N = 128 (male respondents only).