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Kaplan–Meier estimates of progression-free survival (pfs) at 10 years in the zoledronic acid (zol, n = 151) and control arms (n = 157). The 10-year pfs rate was significantly higher (p < 0.001) in the zol arm than in the control arm (66% vs. 52%; 95% confidence interval: 60% to 73% vs. 46% to 57%).
