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. 2023 Aug 19;8(11):2345–2355. doi: 10.1016/j.ekir.2023.08.006

Figure 3.

Figure 3

Scatter plots of the estimated GFR of all equations versus the measured GFR. Scatter plot of the association between the glomerular filtration rate measured by iohexol or iothalamate clearance (mGFR) and the eGFR calculated using the PENK-Crea equation, the conventional MDRD and 2009 CKD-EPI equations and the new 2021 CKD-EPI equation (eGFR) in the validation cohort. Bias is defined as the mean difference with standard deviation (in ml/min/1.73 m2), P30 accuracy as the percentage of estimated GFRs that is within a ±30% range of the mGFR, and correct GFR category as the percentage of patients that are correctly classified in GFR categories (all in ml/min/1.73 m2): “G4–5, ≤29 ml/min/1.73 m2,” “G3a–b, 30–59 ml/min/1.73 m2,” G2, “60–89 ml/min/1.73 m2,” and “G1, ≥90 ml/min/1.73 m2.” The nonlinear fit is calculated using a 2-phase association. GFR, glomerular filtration rate.