Risk factors | Based on Gail model (Caucasian) | Based on Matsuno AABCS model (Chinese-American and other Asian-American) | ||||||
---|---|---|---|---|---|---|---|---|
 | O | E | E/O | 95% CI for E/O | O | E | E/O | 95% CI for E/O |
Total | 409 | 758.18 | 1.85 | (1.68, 2.04) | 409 | 404.70 | 0.99 | (0.90, 1.09) |
Age at menarche, years | Â | Â | Â | Â | Â | Â | Â | Â |
   ≥14 | 226 | 477.32 | 2.11 | (1.85, 2.41) | 226 | 253.58 | 1.12 | (0.98, 1.28) |
   12-13 | 161 | 252.42 | 1.57 | (1.34, 1.83) | 161 | 136.16 | 0.85 | (0.72, 0.99) |
   < 12 | 22 | 28.44 | 1.29 | (0.85, 1.96) | 22 | 14.96 | 0.68 | (0.45, 1.03) |
 | χ2 = 166.89, P < 0.001 | χ2 = 10.84, P = 0.004 | ||||||
Any breast biopsy Age at screening: ≥50 years |  |  |  |  |  |  |  |  |
   No | 370 | 706.46 | 1.91 | (1.72, 2.11) | 370 | 366.38 | 0.99 | (0.89, 1.10) |
   Yes | 39 | 51.72 | 1.33 | (0.97, 1.82) | 39 | 38.32 | 0.98 | (0.72, 1.34) |
 | χ2 = 163.37, P < 0.001 | χ2 = 0.05, P = 0.827 | ||||||
Number of affected first-degree relatives Age at first live birth: < 20 years | Â | Â | Â | Â | Â | Â | Â | Â |
   0 | 48 | 93.42 | 1.95 | (1.47, 2.58) | 48 | 41.62 | 0.87 | (0.65, 1.15) |
   1 | 2 | 4.59 | 2.30 | (0.57, 9.18) | 2 | 1.76 | 0.88 | (0.22, 3.52) |
   > 1 | 0 | 0.13 | - | - | 0 | 0.02 | - | - |
Number of affected first-degree relatives Age at first live birth: 20-24 years | Â | Â | Â | Â | Â | Â | Â | Â |
   0 | 113 | 246.74 | 2.18 | (1.82, 2.63) | 113 | 123.47 | 1.09 | (0.91, 1.31) |
   1 | 9 | 10.97 | 1.22 | (0.63, 2.34) | 9 | 5.84 | 0.65 | (0.34, 1.25) |
   > 1 | 2 | 0.62 | 0.31 | (0.08, 1.24) | 2 | 0.15 | 0.08 | (0.02, 0.30) |
Number of affected first-degree relatives Age at first live birth: 25-29 years or nulliparous | Â | Â | Â | Â | Â | Â | Â | Â |
   0 | 156 | 269.37 | 1.73 | (1.48, 2.02) | 156 | 150.21 | 0.96 | (0.82, 1.13) |
   1 | 13 | 15.78 | 1.21 | (0.70, 2.09) | 13 | 11.19 | 0.86 | (0.50, 1.48) |
   > 1 | 0 | 0.36 | - | - | 0 | 0.14 | - | - |
Number of affected first-degree relatives Age at first live birth: > 30 years | Â | Â | Â | Â | Â | Â | Â | Â |
   0 | 62 | 110.49 | 1.78 | (1.39, 2.29) | 62 | 65.18 | 1.05 | (0.82, 1.35) |
   1 | 3 | 5.61 | 1.87 | (0.60, 5.80) | 3 | 5.04 | 1.68 | (0.54, 5.21) |
   > 1 | 1 | 0.09 | 0.09 | (0.01, 0.64) | 1 | 0.08 | 0.08 | (0.01, 0.57) |
 | χ2 = 179.85, P < 0.001 | χ2 = 38.66, P < 0.001 |