Table 4. Multivariate logistic regression of sociodemographic and behavioral factors, and clinical, obstetric, and health care history in prenatal care and maternity hospital for syphilis in women. Recife, State of Pernambuco, Brazil, 2014.

Variable	Unadjusted			Adjusted
	OR	95%CI	p	OR	95%CI	p
Level 1a – Demographic characteristics
Education level			< 0.001			0.024
High school and university (C/I)	1.00			1.00
Basic education (C)	1.71	1.09–2.67		1.27	0.73–2.19
Basic education (I)/Illiterate	3.10	1.99–4.82		2.02	1.17–3.47
Access to telephone			0.001			0.006
Yes	1.00			1.00
No	2.95	1.58–5.52		2.45	1.28–4.70
Level 2b – Behavioral characteristics
Religion			0.044			0.012
No religion	1.00			1.00
Catholic	1.16	0.77–1.74		1.70	1.07–2.68
Evangelical	0.68	0.45–1.03		0.86	0.53–1.39
Number of pregnancies including current one			0.002			0.008
1	1.00			1.00
2–3	1.64	1.11–2.43		1.77	1.12–2.79
≥ 4	2.23	1.39–3.58		2.27	1.30–3.95
Number of sex partners in the last 12 months			< 0.001			0.004
1	1.00			1.00
2	1.93	1.18–3.17		1.66	0.93–2.97
≥ 3	4.60	2.42–8.75		3.15	1.51–6.53
Age at which started using drugs (years)			< 0.001			0.003
Does not use	1.00			1.00
≥ 18	1.83	0.73–4.60		0.50	0.16–1.53
≤ 17	5.66	3.03–10.56		3.04	1.45– 6.40
Current partner uses drugs			<0.001			0.026
No	1.00			1.00
Yes	2.26	1.47–3.47		1.78	1.07–2.98
Level 3c – Clinical, obstetric, and health care history in prenatal care and maternity hospital
Number of appointments in the prenatal care			< 0.001			< 0.001
≥ 7	1.00			1.00
6–4	1.31	0.86–2.00		1.48	0.88–2.49
3–1	3.60	2.17–5.98		3.53	1.86–6.69
No prenatal care	4.47	2.53–7.90		3.20	1.36–7.54
History of previous STI			< 0.001			< 0.001
No	1.00			1.00
Yes	10.68	6.46–17.66		9.70	5.46–17.24

C: complete; I: incomplete; STI: sexually transmitted infection

^a Odds ratio adjusted for all variables of level 1 with p ≤ 0.20.

^b Odds ratio adjusted for all variables of level 1 and variables of level 2 with p ≤ 0.20.

^c Odds ratio adjusted for all variables of level 1 and 2 and variables of level 3 with p ≤ 0.20.