Table 2.

Performance of 3 prediction models in the derivation cohort

Indices	Model 1	Model 2	Model 3
Discrimination
c-statistic	0.68 (0.61 to 0.75)	0.73 (0.66 to 0.80)	0.77 (0.71 to 0.83)
NRIa
NRI for events	Reference	3.3 (−14.6 to 29.3)	16.4 (−7.7 to 41.6)
NRI for nonevents	Reference	9.7 (−6.4 to 28.8)	12.6 (−3.5 to 31.7)
Overall NRI	Reference	13.0 (−4.5 to 33.4)	29.0 (6.8 to 56.6)
P		0.079	0.002
Calibration
Brier score	0.16 (0.13 to 0.18)	0.15 (0.13 to 0.18)	0.14 (0.12 to 0.17)
Pb	0.83	0.66	0.52
Overall performance
R2 statistic (%)	11.2	17.4	23.6
AIC	278	268	257

Model 1/2/3 indicates the core/sarcopenia/full model.

AIC, Akaike information criterion; NRI, net reclassification improvement.

^aNRI was calculated with reference to model 1 (model 2/model 3 vs model 1).

^bP value was calculated by the Hosmer-Lemeshow goodness-of-fit test.