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 |