Table 8.

Bias, precision, and accuracy of creatinine and cystatin C estimates in female patients (n = 38)a

BiasPrecisionAccuracy % Within
10%30%
Measured values
    creatinine clearance4.020.82976
Estimates using creatinine
    Cockcroft-Gault−2.412.52687
    abbreviated MDRD−11.012.12169
    original MDRD−11.911.41666
    Walser−8.413.02176
    Jelliffe−7.713.92674
    Mawer7.623.21663
    Nankivell−1.412.15587
Estimates using cystatin C
    Filler2.911.14787
    Le Bricon0.511.34289
    Larsson−9.013.91179
    Hoek−7.211.22690
  • a Bias was defined as the mean difference between measured (99Tc-DTPA) and estimated GFR; precision was defined as the SD of the difference between measured (99 Tc-DTPA) and estimated GFR. Both precision and bias were expressed as ml/min per 1.73 m2; accuracy was defined as the proportion of values that were within 10 or 30% of the measured (99 Tc-DTPA) GFR.