Risk and Protective Factors for Breast Cancer in Midwest of Brazil

Table 5

Per capita income, area of residence, physical activity, and family history of breast cancer of women with breast cancer (cases) and respective controls, from Midwest of Brazil (2008–2010).

Variable*	Cases (𝑛=93)		Controls (𝑛=186)		Adjusted OR (95% CI)	𝑃 value**
	𝑛	%	𝑛	%
First level
Per capita income (US$)
>1/2 Brazilian minimum wage	43	46.24	105	60.00	1.00	—
≤1/2 Brazilian minimum wage	50	53.76	70	40.00	1.87 (1.06–3.29)	0.031
Area of residence
Urban	67	83.75	155	96.27	1.00	—
Rural	13	16.25	6	3.73	4.93 (1.65–14.73)	0.004
Second level
Family history of breast cancer
No	85	91.40	182	97.85	1.00	—
Yes	8	8.60	4	2.15	5.38 (1.46–19.93)	0.012
Physical activity (past 6 months)
Sedentary	34	36.56	24	12.90	1.00	—
Irregularly active B	16	17.20	33	17.74	0.50 (0.18–1.37)	0.178
Irregularly active A	9	9.68	39	20.97	0.26 (0.09–0.77)	0.016
Active	34	36.56	90	48.39	0.23 (0.10–0.55)	0.001
Leisure physical activity (at 20 years old)
No	74	93.67	119	74.38	1.00	—
Yes	5	6.33	41	25.62	0.13 (0.03–0.54)	0.005

OR: odds ratio and CI: confidence interval; multivariate analyses adjusted for educational level, per capita income, area of residence, bearing children, number of children, height, physical activity (past 6 months), previous occupational and leisure physical activity, family history of cancer (any type), and family history of breast cancer (mother/sisters).
*Per capita income: Brazilian minimum wage corresponds to approximately US$ 300, 11 control subjects did not indicate their per capita income; area of residence: information is unavailable for 13 cases and 25 controls.
**Wald statistic.