Fig. 2.

Kaplan–Meier analyses of recurrence-free renal survival in patients undergoing tonsillectomy plus steroid therapy and steroid therapy alone, stratified by mesangial hypercellularity score in the Oxford Classification. a Patients with mesangial hypercellularity (M1), as defined by the Oxford Classification. The combination of tonsillectomy plus steroid therapy significantly reduced the cumulative rate of recurrence compared with steroid therapy alone (P = 0.022, log-rank test). b Patients without mesangial hypercellularity (M0). There was no between group difference in cumulative rate of recurrence