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Distribution of iGFR visit 2 measurements by iGFR at visit 1 within the validation data (n = 109). The magnitude of the error between iGFR and eGFR is illustrated by the length of the arrows with the origin at the observed data (iGFR1, iGFR2) and the arrowhead at the estimated value (iGFR1, eGFR2 using model IV, Table 3).
