Table 6.

Bias, precision, and accuracy of creatinine and cystatin C estimates for patients with estimated GFR <60 and ≥60 ml/min per 1.73 m2 a

GFRNBiasPrecisionAccuracy % Within
10%30%
Estimates using creatinine
Cockcroft-Gault
<6072−4.012.91976
≥6045−1.614.64287
abbreviated MDRD
<6090−10.512.62068
≥6027−8.314.53793
original MDRD
<6092−11.711.61564
≥6025−10.814.22888
Walser
<6097−12.514.11557
≥6020−11.115.24085
Jelliffe
<60103−15.115.81548
≥6014−11.016.05093
Mawer
<6051−4.014.52469
≥606621.324.51550
Nankivell
<60680.012.03273
≥6049−3.414.74188
Estimates using cystatin C
Filler
<6065−0.99.63185
≥6052−2.613.45690
Le Bricon
<6070−0.39.73687
≥6047−8.813.05191
<60100−16.913.1849
≥6017−11.519.81276
Hoek
<6088−8.69.62680
≥6029−16.415.21779
• a Bias was defined as the mean difference between measured (

• 99 Tc-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 m

• 2 ; accuracy was defined as the proportion of values that were within 10 or 30% of the measured (

• 99 Tc-DTPA) GFR.