Table 3.

Model diagnostics (with 95% CI)

Measure	Development				External validation
	Apparent performance	Test performance	Average optimism	Optimism corrected
C-statistic	0.738 (0.733 to 0.742)	0.736 (0.726 to 0.746)	+0.002	0.736 (0.731 to 0.740)	0.747 (0.737 to 0.756)
Calibration slope	1.000 (0.981 to 1.019)	0.993 (0.990 to 0.997)	+0.007	0.993 (0.974 to 1.013)	1.000 (0.981 to 1.020)