Table 2.

Summary performance measures for the model and in internal validation (bootstrapping)

	Measure	Final prediction model	Bootstrap analysis Median value (range)
Overall performance	Brier score	0.15	0.14 (0.13–0.16)
Discrimination	AUC	0.70	0.72 (0.67–0.76)
Calibration	Calibration intercept	0.01	0.00 (−0.01 to 0.01)
	Calibration slope	0.98	0.98 (0.93–1.04)

AUC, area under the receiver operating characteristic curve.