Table 3.

The performance of the different models compared to the index eGFR model on the prediction of all-cause mortality

	C-index	P	IDI (95% CI)	P	NRI (95% CI)	P
Index eGFR	0.629 (0.574, 0.684)		Reference		Reference
Mean eGFR	0.619 (0.566, 0.673)	0.846	− 0.003 (− 0.010, 0.002)	0.159	− 0.155 (− 0.336, 0.097)	0.246
SD of eGFR	0.593 (0.541, 0.644)	0.800	− 0.008 (− 0.022, 0.005)	0.199	− 0.154 (− 0.282, 0.011)	0.060
Index eGFR + SD of eGFR	0.671 (0.620, 0.723)	< 0.001	0.008 (0.002, 0.023)	0.007	0.141 (0.017, 0.252)	0.027

CI  confidence interval, IDI  integrated discrimination improvement, NRI  continuous net reclassification improvement, eGFR  estimated glomerular filtration rate, SD  standard deviation