Table 3.

Summary of prediction performance of PredictCBC-1A, PredictCBC-1B, PredictCBC-2.0A, and PredictCBC-2.0B with the corresponding 95% prediction intervals (PI) based on a leave-one-study-out cross-validation procedure

CBC risk prediction model	Performance measure
	Discrimination		Calibration
	AUC (95% PI)		O/E ratio (95% PI)
	5-year	10-year	5-year	10-year
PredictCBC-1A	0.62 (0.51–0.74)	0.63 (0.54–0.71)	0.90 (0.36–2.24)	0.91 (0.34–2.48)
PredictCBC-2.0A	0.66 (0.55–0.76)	0.65 (0.56–0.74)	0.91 (0.35–2.34)	0.92 (0.34–2.54)
PredictCBC-1B	0.59 (0.49–0.69)	0.58 (0.51–0.65)	0.91 (0.32–2.55)	0.92 (0.30–2.80)
PredictCBC-2.0B	0.59 (0.51–0.68)	0.58 (0.51–0.65)	0.91 (0.31–2.63)	0.92 (0.30–2.87)

AUC area under the curve, CBC contralateral breast cancer, PI prediction interval, O/E observed/expected