Table 4.

Logistic Regression Models of Factors Associated with Testing Positive for HIV at Cohort Screening Among Female Sex Workers in Lusaka and Ndola, Zambia (n = 1,377)

	Bivariate models				Final multivariate model
	95% CI				95% CI
	cOR	LLa	ULb	p	aOR	LLa	ULb	p
City
Ndola	Ref	—	—	—	Ref	—	—	—
Lusaka	2.06	1.65	2.56	<.0001	2.01	1.55	2.83	<.0001
Age (per 1 year increase)	1.14	1.12	1.16	<.0001	1.14	1.11	1.17	<.0001
Marital status
Single	Ref	—	—	—	Ref	—	—	—
Divorced/separated	1.81	1.35	2.41	<.0001	0.72	0.50	1.05	.0859
Widowed	9.35	4.75	18.42	<.0001	3.54	2.35	4.83	.0009
RPR for syphilis
Negative	Ref	—	—	—	Ref	—	—	—
Positive	3.68	2.75	4.92	<.0001	3.37	2.35	4.83	<.0001
Previously tested for HIV
Yes	Ref	—	—	—	Ref	—	—	—
No	2.26	1.77	2.87	<.0001	1.87	1.35	2.60	.0002

The following variables were not significant in bivariate analyses and are not tabled: Trichomonas on wet mount result, sperm on wet mount result, and pregnancy (self-reported). The following variables were not significant in initial adjusted analyses and were removed from the final multivariate model through backward elimination and are not tabled: interaction terms between city and trichomonas on wet mount and city and current contraceptive method, and current contraceptive method.

^aLower limit for 95% CI.

^bUpper limit for 95% CI.

AOR, adjusted odds ratio; CI, confidence interval; COR, crude odds ratio.