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. Author manuscript; available in PMC: 2021 Apr 12.
Published in final edited form as: Clin Breast Cancer. 2013 Nov 22;14(3):212–220.e1. doi: 10.1016/j.clbc.2013.11.003

Table 3:

Calibration of breast cancer risk prediction models by risk decile

n Observed (O) Expected (E) E/O 95% CI
BCRAT (Gail) 12843 203 165.18 0.81 (0.71–0.93)
BRCAPRO 12843 203 120.54 0.59 (0.52–0.68)
IBIS (Tyrer-Cuzick) 12843 203 220.92 1.09 (0.95–1.25)
Deciles of predicted risk
1 2 3 4 5 6 7 8 9 10 X2 p
BCRAT (Gail)
 Observed 8 5 16 17 12 31 25 24 24 41 26.78 0.0015
 Expected 4.41 7.73 10.27 12.28 14.21 16.02 18.16 20.51 24.27 37.31
BRCAPRO
 Observed 8 13 11 18 22 14 21 27 32 37 75.82 ∼=0
 Expected 4.07 6.93 9.67 11.99 12.84 12.84 12.84 12.84 12.84 23.68
IBIS (Tyrer-Cuzick)
 Observed 6 9 12 10 19 26 25 24 31 41 8.64 0.47
 Expected 8.14 12.17 14.84 16.97 18.76 20.58 22.58 25.2 30.3 51.35