Risk factors | Based on SBCSP (95% CI) | Gail model: BCDDP (95% CI) |
---|---|---|
Age at menarche, years | Â | Â |
   ≥14 | 1.00 (referent) | 1.00 (referent) |
   12-13 | 1.39 | 1.10 |
   < 12 | 1.95 | 1.21 |
Any breast biopsy Age at screening: ≥50 years |  |  |
   No | 1.00 (referent) | 1.00 (referent) |
   Yes | 1.97 | 1.28a |
Number of affected first-degree relatives Age at first live birth: < 20 years | Â | Â |
   0 | 1.00 (referent) | 1.00 (referent) |
   1 | 3.61 | 2.61 |
   > 1 | 13.04 | 6.80 |
Number of affected first-degree relatives Age at first live birth: 20-24 years | Â | Â |
   0 | 1.33 | 1.24 |
   1 | 4.14 | 2.68 |
   > 1 | 12.91 | 5.78 |
Number of affected first-degree relatives Age at first live birth: 25-29 years or nulliparous | Â | Â |
   0 | 1.76 | 1.55 |
   1 | 4.75 | 2.76 |
   > 1 | 12.79 | 4.91 |
Number of affected first-degree relatives Age at first live birth: > 30 years | Â | Â |
   0 | 2.34 | 1.93 |
   1 | 5.44 | 2.83 |
   > 1 | 12.67 | 4.17 |