Table 3.

Analysis of estimated GFR correlations with sinistrin clearance and accuracy of studied models

Fitted Models and Schwartz Formula	Cohen κ Coefficient	Accuracy within 10% of iGFR (%)	Accuracy within 30% of iGFR (%)
Linear CysC-based model	0.24	42	84
Inverse CysC-based model	0.21	42	83
Logarithmic CysC-based model	0.23	42	84
Quadratic CysC-based model	0.24	41	84
Linear SCreat-based model	0.46	49	90
Quadratic SCreat-based model	0.53	52	93
New combined SCreat and CysC–based quadratic model	0.56	53	97
Combined SCreat, CysC, and BUN–based quadratic model	0.56	53	97
Combined SCreat and CysC–based logarithmic Schwartz model	0.49	54	96
Combined SCreat and CysC Schwartz formula	0.15	35	86

iGFR, sinistrin clearance; SCreat, serum creatinine; CysC, cystatin C.