Stratified analysis on the basis of eGFR and U-Prot to determine renal survival rates of patients with IgAN treated with or without tonsillectomy at any time. Survival rates until ESKD was reached (A) for patients with eGFR <60 ml/min per 1.73 m2 and U-Prot <1.0 g/d (T[+], 94%; T[−], 62%; P=0.67), (B) for patients with eGFR ≥60 ml/min per 1.73 m2 and U-Prot <1.0 g/d (T[+], 99%; T[−], 87%; P=0.09), (C) for patients with eGFR <60 ml/min per 1.73 m2 and U-Prot ≥1.0 g/d (T[+], 88%; T[−], 33%; P=0.005), and (D) for patients with eGFR ≥60 ml/min per 1.73 m2 and U-Prot ≥1.0 g/d (T[+], 100%; T[−], 69%; P=0.007). T(+), underwent tonsillectomy; T(−), did not undergo tonsillectomy.