Table 2.

Changes in predictive accuracy for 30-day mortality and non-home discharge with addition of frailty indices to base prediction model

	Base	Base + RAI	Base + mFI-5
30-day Mortality
AUC	0.77 (0.76, 0.79)	0.78 (0.76, 0.79)	0.77 (0.76, 0.79)
ICI	0.01 (0.00, 0.02)	0.01 (0.00, 0.02)	0.01 (0.00, 0.02)
Reclassification
Events (%)		−40	−10
Non-events (%)		57	21
NRI		0.17 (0.06, 0.35)	0.09 (−0.09, 0.19)
TPR (%)	74	75	74
FPR (%)	35	34	35
TNR (%)	65	66	65
FNR (%)	26	25	26
Non-home Discharge
AUC	0.74 (0.71, 0.77)	0.75 (0.72, 0.78)	0.75 (0.72, 0.77)
ICI	0.02 (0.01, 0.04)	0.03 (0.01, 0.05)	0.02 (0.01, 0.04)
Reclassification
Events (%)		−32	−12
Non-events (%)		56	31
NRI		0.24 (0.10, 0.36)	0.18 (−0.02, 0.31)
TPR (%)	45	45	46
FPR (%)	12	12	12
TNR (%)	88	88	88
FNR (%)	55	55	54

Abbreviations: RAI = Risk Analysis Index; mFI-5 = 5-factor Modified Frailty Index; AUC = area under the receiver operating curve; ICI = integrated calibration index; NRI = continuous net reclassification index; TPR = true positive rate; FPR = false positive rate; TNR = true negative rate; FNR = false negative rate.