Table 3.

Mean bias and accuracies according to KDOQI classification and equations

KDOQI ClassificationCGMDRDCKD-EPISchwartz 2009Schwartz-Lyon
Stage 1: GFR ≥90 (n=541)
 mGFR=113.4±18.1
 eGFR150.5±37.0152.1±53.9136.0±21.0103.4±20.499.6±21.0
 mean ratio (eGFR/mGFR)1.33±0.291.35±0.451.22±0.210.92±0.160.89±0.16
 10% accuracy19252641a35a
 30% accuracy51556691a90a
Stage 2: 60< GFR ≥90 (n=312)
 mGFR=75.2±8.4
 eGFR 110.5±28.8110.2±38.9113.2±26.478.4±17.874.0±17.2
 mean ratio (eGFR/mGFR)1.47±0.351.46±0.481.50±0.331.04±0.210.98±0.20
 10% accuracy12191039a37a
 30% accuracy34473284a86a
Stage 3: 30< GFR ≥60 (n=178)
 mGFR=46.6±8.4
 eGFR71.5±19.067.4±24.173.7±23.651.9±13.348.0±11.5
 mean ratio (eGFR/mGFR)1.55±0.351.45±0.461.60±0.461.12±0.251.05±0.21
 10% accuracy720832a36a
 30% accuracy29413080b87b
Stages 4–5: GFR <30 (n=23)
 mGFR=22.2±4.7
 eGFR44.4±12.337.7±12.140.8±13.532.5±9.029.9±8.1
 mean ratio (eGFR/mGFR)2.03±0.491.7±0.511.80±0.541.48±0.361.36±0.32
 10% accuracy044922
 30% accuracy430223943
  • mGFR and eGFR are measured in milliliters per minute per 1.73 m2.

  • a P<0.05 between pediatric formulas and other equations, favoring pediatric formulas, but without significant difference between Schwartz 2009 and Schwartz-Lyon.

  • b P<0.05 between pediatric formulas and other equations, favoring Schwartz-Lyon. All results are expressed in mean ± SD. CKD stages 4–5 were combined due to the small number of patients.