the stone recurrence rate of all of the 111 cases showed significant decrease during prophylactic treatment with allopurinol ( p less than 0.01 ) , although the observation period before treatment was 73.0 +/- 65.8 months and that during and after treatment was 28.2 +/- 12.1 months .
C0006736
stone
C0002144
allopurinol