Progression to dialysis according to renal stage. (A) Testing cohort (461 patients; P < .001). (B) Validation cohort (271 patients; P < .001). Renal stage I: both proteinuria ≤5 g/24 h and eGFR ≥50 mL/min per 1.73 m2. Renal stage II: either proteinuria >5 g/24 h or eGFR <50 mL/min per 1.73 m2. Renal stage III: both proteinuria >5 g/24 h and eGFR <50 mL/min per 1.73 m2.