Overall performance of agreement between eGFR and sGFR in the additional external validation data set.

Abbreviations: eGFR, estimated glomerular filtration rate; sGFR, standard glomerular filtration rate; CG, Cockcroft-Gault; MDRD, Modification of Diet in Renal Disease; CKD-EPI, Chronic Kidney Disease Epidemiology Collaboration; GABP, BP network with genetic algorithm a:The difference between eGFR and sGFR was regressed against the average of eGFR and sGFR. X-axis represented the average of eGFR and sGFR. Y-axis represented the difference between eGFR and sGFR. *:P<0.001 compared with GABP6 network-GFR. †:P<0.01 compared with GABP6 network-GFR. ‡:P<0.05 compared with GABP6 network-GFR.