Table 4.

Model performance measures.

Prediction model	R2	Optimism-corrected R2	AUC (95% CI)	Optimism-corrected AUC	Calibration slope b	Calibration intercept	Brier score	CHCH test P
Moderate-to-severe APSP
Full model	0.27	0.25	0.764 (0.739–0.789)	0.753	0.95	−0.006	0.20	0.58
Reduced model	0.26	0.25	0.762 (0.737–0.787)	0.754	0.96	−0.006	0.20	0.51
Severe APSP
Full model	0.18	0.15	0.748 (0.709–0.787)	0.724	0.89	−0.18	0.10	0.57
Reduced model	0.18	0.15	0.743 (0.705–0.782)	0.724	0.91	−0.15	0.10	0.68

AUROC, area under the receiver operating curve; CHCH, le Cessie–van Houwelingen–Copas Hosmer; CI, confidence interval; R², Nagelkerke's pseudo-R².