Table 2.

The cutoff points of FRAIL-NH to classify two-class frailty (Non-frail + Pre-frail vs Frail) based on FI

Frailty class	FI	FRAIL-NH
	Cutoff points	Cutoff points	AUC (95% CI)	Sensitivity (%)	Specificity (%)	Youden Index
	0.25	4	0.87 (0.84–0.91)	66.1	90.2	0.56
Two-class	0.21	2	0.86 (0.82–0.90)	87.6	66.3	0.54
	0.45	8	0.93 (0.89–0.97)	94.1	82.8	0.77

FI Frailty Index; CI confidence interval; AUC the area under the curve