Variables | ORa | 95% CI | p-value |
Early age at menarche (<12 years) | 1.660 | 1.196 - 2.303 | 0.002 |
Late menopause (>55 years) | 2.360 | 1.911 - 2.914 | <0.001 |
Oral contraceptive (>6 years) | 1.252 | 1.014 - 1.547 | <0.001 |
Hormone replacement therapy | 1.256 | 0.491 - 3.217 | 0.634 |
Early childbearing (<30 years) | 0.229 | 0.163 - 0.323 | <0.001 |
Multiparity | 0.639 | 0.533 - 0.766 | <0.001 |
Lactation (>6 months) | 0.652 | 0.546 - 0.780 | <0.001 |
Family history of breast First degree | 11.146 | 2.535 - 49.005 | 0.001 |
Second degree | 0.641 | 0.255 - 1.613 | 0.345 |
Exposure to irradiation | 1.206 | 0.515 - 2.825 | 0.666 |