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Recurrence rates vary substantially among patients with symptomatic kidney stones. In this population-based study from Mayo Clinic Rochester, researchers developed a tool to predict recurrence — not only after initial episodes, but also after subsequent episodes — in 3400 patients whose first episodes occurred between 1984 and 2017.
The recurrence rate for symptomatic episodes ranged from 3.4 per 100 person-years after initial episodes to 20.3 per 100 person-years after five lifetime episodes. In a multivariable model, clinical and demographic predictors of recurrence included younger age, higher body-mass index, male sex, family history of stones, pregnancy at last stone episode, and stone composition other than calcium oxalate. Radiographi…