Table 3. Backward elimination multivariate logistic regression for association of HIV screening among pregnant women and sociodemographic and health care-related factors (sample size = 2,633).

Factor	Categories	Adjusted odds-ratios	95% confidence limits
Departments	HIV incidence < 2 / 10,000 population	Reference
	HIV incidence 2 - 2.9 / 10,000 population	0.73	0.65 - 0.81*
	HIV incidence ≥ 3 / 10,000 population	0.50	0.48 - 0.53*
Age groups	15 - 19	0.87	0.80 - 0.94*
	20 - 29	Reference
	30 - 39	0.90	0.85 - 0.95*
	40 - 49	0.77	0.70 - 0.84*
Educational level	Literacy course or no education	Reference
	Primary	1.22	1.12 - 1.32*
	Secondary	1.44	1.32 - 1.57*
	University	2.74	2.28 - 3.30*
Employment status	Currently unemployed	Reference
	Currently employed	0.84	0.77 - 0.91*
Household economic level	Lowest monthly expenditure tertile	Reference
	Average monthly expenditure tertile	1.03	0.97 - 1.09
	Highest monthly expenditure tertile	1.39	1.30 - 1.49*
Medical insurance	Covered by a health insurance	Reference
	Not covered by a health insurance	0.64	0.60 - 0.72*
Number of antenatal care visits	1 - 3 times	Reference
	4 - 6 times	1.16	1.05 - 1.27*
	> 6 times	1.52	1.39 - 1.67*
Physician-led antenatal care visit	Yes	Reference
	No	0.60	0.53 - 0.67*
Nurse-led antenatal care visit	Yes	Reference
	No	1.15	1.09 - 1.21*
Place of antenatal care visit	Public hospital	Reference
	Public health unit	0.55	0.49 - 0.60*
	Other public health care setting	0.43	0.38 - 0.49*
	Private hospital	0.50	0.33 - 0.75*
	Other private health care setting	0.35	0.30 - 0.42*

^*Statistical difference with value of 1 outside the 95% confidence limits