Table 2. Mean calculated CrCl or GFR, mean absolute difference, bias, precision, and accuracy of GFR prediction equations compared with measured GFRa

Mean CrCl/GFRb (Range)Mean Absolute DifferenceMedian Absolute DifferenceMedian % Absolute DifferenceBiascR2d (Precision)Pearson CorrelationAccuracy % within
30%50%
a CrCl, creatinine clearance; CG, Cockcroft-Gault; MDRD, Modification of Renal Disease.
b Mean calculated CrCl or GFR expressed as mean ± SD (range).
c Bias is the mean prediction error:where pei = predicted value - true value and N = sample size.
d R2 statistic was derived by simple linear regression and reflects the predictive ability of the model.
e Adjusted for BSA of 1.73 m2.
f Expressed as ml/min per 1.73 m2.
CGe129.6 ± 48.837.926.723%16.80.060.2458%79%
(50.1–288.5)
CG-GFRe108.9 ± 4132.930.525%−4.00.060.2559%83%
(42.1–242.3)
MDRD 1f97.6 ± 2532.930.625%−15.20.030.1769%96%
(55.8–201.1)
MDRD 2f94.5 ± 25.028.723.522%−18.30.020.1565%95%
(50.3–184.9)
Jelliffe 1e92.3 ± 22.126.026.523%−13.20.050.2367%96%
(55.3–176.0)
Jelliffe 296.8 ± 22.226.019.017%−16.00.010.2567%95%
(59.7–188.0)
Mawer141.6 ± 66.049.635.430%28.70.070.2650%72%
(40.9–396.7)
Bjornsson122.5 ± 37.329.524.823%9.70.080.2866%86%
(58.2–290.5)
Gates94.4 ± 24.928.825.425%−18.40.020.1466%95%
(50.3–207.3)
Corcoran-Salazar114.5 ± 29.126.120.919%1.70.040.2176%92%
(56.7–199.4)