Mean Absolute Bias | Precision (SD) | Mean % Bias | Precision (SD) | Median Absolute Bias | Precision (IQR) | Accuracy % Within 30% | |
---|---|---|---|---|---|---|---|

Full cohort (n = 94) | |||||||

eGFR (Mayo Clinic) | −5.4 | 12.2 | −7.0 | 22.7 | −4.9 | 16.6 | 80 |

eGFR (CHEO) | 1.8 | 14.7 | 6.4 | 28.1 | 1.0 | 19.9 | 79 |

eGFR (CHEO corrected) | −4.9 | 14.3 | −6.0 | 25.4 | −4.7 | 19.3 | 78 |

CysC <1.41 (n = 47) | |||||||

eGFR (Mayo Clinic) | −4.1 | 14.5 | −2.1 | 24.7 | −3.7 | 23.5 | 82 |

eGFR (CHEO) | 5.3 | 17.7 | 12.0 | 30.3 | 4.4 | 28.7 | 76 |

eGFR (CHEO corrected) | −2.6 | 17.5 | −0.4 | 27.5 | −3.8 | 28.2 | 80 |

CysC ≥1.41 (n = 47) | |||||||

eGFR (Mayo Clinic) | −6.7 | 9.3 | −11.9 | 19.6 | −5.2 | 11.4 | 74 |

eGFR (CHEO) | −1.7 | 9.8 | 0.9 | 24.8 | −0.80 | 13.6 | 74 |

eGFR (CHEO corrected) | −7.1 | 9.9 | −12.4 | 21.7 | −5.5 | 13.2 | 72 |

a Bias, percent bias, and precision expressed in ml/min per 1.73 m

^{2}. Bias was defined as the absolute difference between the eGFR and the mGFR (eGFR − mGFR), and as the percentage difference ([eGFR − mGFR]/ mGFR × 100). A negative bias indicates that the GFR is underestimated by the prediction equation. Precision was described by both the interquartile range of the median bias and the standard deviation (SD) of the mean bias. Accuracy was defined as the percentage of eGFR*estimates*lying within 30% of the mGFR. eGFR, estimated GFR; IQR, interquartile range; CysC, cystatin C; CHEO, Children's Hospital of Eastern Ontario; mGFR, measured GFR.