Table 8.

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

BiasPrecisionAccuracy % Within
Measured values
    creatinine clearance4.020.82976
Estimates using creatinine
    abbreviated MDRD−11.012.12169
    original MDRD−11.911.41666
Estimates using cystatin C
    Le Bricon0.511.34289
  • 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.