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