Correlation, bias, precision and accuracy (P30) of prediction equations to estimate relative mGFR (mL/min/1.73 m2)
| At discharge | Correlation (R) | Bias, median error (%) | Precision (IQR), mL/min/1.73 m2 | P30 (95% CI) |
|---|---|---|---|---|
| CG | 0.73 | −1.2 (−1.3) | 22.5 | 75.0% (62% to 88%) |
| MDRD-IDMS | 0.78 | −0.8 (−1.3) | 17.9 | 82.5% (70.5% to 94.5%) |
| CKD-EPI | 0.81 | 0.9 (1.5) | 17.1 | 82.5% (70.5% to 94.5%) |
| rG-CystC | 0.89 | −12.2 (−17.8) | 14.8 | 80.0% (68% to 92%) |
Bias was defined as the median percentage error between eGFR and mGFR; positive values indicate an overestimation of mGFR. Precision was assessed as the IQR expressed in mL/min/1.73 m2 of the difference eGFR—mGFR. Accuracy within 30% (P30) was the percentage of estimates within 30% of mGFR. Correlation between eGFR and mGFR was reported as correlation coefficients (R).
CG, Cockcroft-Gault; CKD-EPI, Chronic Kidney Disease-Epidemiology Collaboration; eGFR, estimated glomerular filtration rate; mGFR, measured GFR; MDRD-IDMS, Modification of Diet in Renal Disease—Isotope Dilution Mass Spectrometry; rG-CystC, relative Grubb cystatin C.