Variable

Cases n (%)

Controls n (%)

OR (CI 95%)

P

Past history of breast cancer

Yes

21 (20)

52 (24.8)

1.31 (0.74 - 2.32)

0.76 (0.43 - 1.34)

0.378

No

84 (80)

158 (75.2)

Past history of other cancers

Yes

16 (15.2)

34 (16.2)

1.07 (0.56 - 2.04)

0.93 (0.49 - 1.78)

0.83

No

89 (84.8)

176 (83.8)

Breast pathology

Yes

16 (15.2)

17 (8.1)

0.49 (0.23 - 1.03)

2.04 (0.97 - 4.22)

0.051

No

89 (84.)

193 (91.9)

Parity

0

19 (18.1)

68 (32.4)

0.46 (0.26 - 0.82)

0.008

1 - 2

12 (11.4)

31 (14.7)

0.74 (0.36 - 1.51)

0.41

3 - 5

47 (44.8)

76 (36.2)

1.43 (0.89 - 2.3)

0.14

>5

27 (25.7)

35 (16.7)

1.73 (0.98 - 3.1)

0.059

Age at menarche

<12 years

11 (10.5)

35 (16.7)

0.58 (0.28 - 1.2)

0.146

12 - 14 years

42 (40)

91 (43.3)

0.87 (0.54 - 1.4)

0.57

14 - 16 years

38 (36.2)

62 (29.5)

1.35 (0.82 - 2.22)

0.23

>16 years

14 (13.3)

22 (10.5)

1.31 (0.64 - 2.67)

0.45

Hormonal contraception

Yes

33 (31.4)

54 (25.7)

0.75 (0.81 - 1.26)

0.285

No

72 (68.6)

156 (74.3)

1.32 (0.79 - 1.22)

Duration of hormonal contraception

<24 months

18 (17.1)

39 (18.5)

0.46 (0.17 - 1.14)

0.95

24 - 60 months

8 (7.6)

11 (5.2)

1.27 (0.44 - 3.52)

0.67

60 - 120 months

7 (6.6)

4 (1.9)

3.36 (0.9 - 12.57)

0.071

Menopause

Yes

44 (41.9)

45 (21.4)

0.37 (0.22 - 0.62)

No

61 (58.1)

165 (78.6)

2.65 (1.59 - 4.39)

0.002

Breastfeeding

Yes

89 (84.8)

171 (81.4)

0.78 (0.41 - 1.49)

No

16 (15.2)

39 (18.6)

1.27 (0.67 - 0.40)

0.46

Duration of breastfeeding

1 - 12 months

8 (8.9)

24 (14.1)

0.61 (0.26 - 1.41)

0.244

12 - 24 months

14 (15.7)

33 (19.2)

0.78 (0.39 - 1.55)

0.49

24 - 48 months

20 (22.4)

48 (28.0)

0.74 (0.41 - 1.35)

0.33

48 - 72 months

18 (20.2)

35 (20.4)

0.98 (0.52 - 1.86)

0.96