Table 2. Prevalence and 95% confidence intervals of contraindicated use of oral contraceptive among users of the method, according to sociodemographic characteristics. VIGITEL, Brazil, 2008.

Sociodemographic characteristics	Women using OCP

	n	%	95%CI	p^a	PR	95%CI	p^b
Education level (years)				< 0.0001
12 and more	1,840	6.3	4.4–9.0		1.0	-	-
9 to 11	1,670	10.4	8.2–13.0		1.6	1.1–2.5	0.022
0 to 8	475	23.8	18.5–30.0		3.8	2.4–5.8	< 0.000
Age (years)				< 0.0001
18 to 24	1,172	6.2	3.4–9.6		1.0	-	-
25 to 34	1,858	7.5	5.7–9.7		1.2	0.7–2.0	0.493
35 to 44	823	30.7	25.0–37.0		4.9	3.0–8.0	< 0.000
45 to 49	132	45.8	31.3–61.1		7.3	4.2–12.8	< 0.000
Marital status				0.0001
Single	2,021	8.8	6.8–11.3		1.0	-	-
Married	1,802	14.8	12.1–18.1		1.7	1.2–2.3	0.001
Widow	26	15.0	5.3–35.8		1.7	0.6–4.7	0.303
Separated/Divorced	136	27.3	15.7–43.1		3.1	1.8–5.5	< 0.000
Has health plan or insurance				0.003
Yes	2,308	14.8	12.2–17.7		1.0	-	-
No	1,677	9.2	7.1–11.9		0.6	0.4–0.8	0.004
Skin color				0.176
White	1,832	9.9	7.7–12.5		1.0	-	-
Black	190	11.2	6.6–18.5		1.1	0.6–2.0	0.660
Brown	1,942	13.6	11.0–16.8		1.4	1.0–1.9	0.530
Other	21	21.0	5.0–57.2		2.1	0.6–7.8	0.255
Region				0.844
North	928	14.0	10.3–18.9		1.0	-	-
Northeast	979	11.5	8.8–15.0		0.8	0.5–1.3	0.334
Midwest	722	10.7	8.3–13.7		0.8	0.5–1.1	0.179
Southeast	734	11.8	9.0–15.3		0.8	0.6–1.2	0.394
South	632	11.9	9.2–15.2		0.8	0.6–1.2	0.409

OCP: oral contraceptive pills; PR: prevalence ratio

^a Pearson’s Chi-squared.

^b Wald’s Chi-squared.