Figure 2.

Estimated glomerular filtration rate changes according to baseline CKD stages in each CKD etiology group. CKD of each groups with A1-A3 are classified using eGFR as followed based on KDIGO guideline³⁰: stage G1 ≥ 90 mL/min/1.73 m², stage G2 60–89 mL/min/1.73 m², stage G3a 45–59 mL/min/1.73 m², stage G3b 30–44 mL/min/1.73 m², stage G4 15–29 mL/min/1.73 m², and stage G5 < 15 mL/min/1.73 m² without kidney replacement therapy. CKD, chronic kidney disease; eGFR, estimated glomerular filtration rate.