Comparison of GFR using CKD-EPI equations and the MDRD Study equation
The prevalence of each estimated GFR category using CKD-EPI equations and the MDRD Study equation is shown in Fig. 2. The prevalence of G1 was 67.9% and 59.4% by CKD-EPI equations and the MDRD study equation, and G2 was 29.8% and 38.7%, respectively. The prevalence of GFR < 60 mL/min/1.73 m2 by the MDRD study equation was 2.0%, which was significantly less than the 2.2% by CKD-EPI equations (p < 0.001).