[Statistical observation of urolithiasis at the Hokkaido University Hospital (1959-1975) (author's transl)].

In recent 17 years from 1959 to 1975, 32296 patients were visited to the Urological department of Hokkaido university hospital. 1192 patients (male 818, female 374) were diagnosed as urolithiasis in this period. The incidence was 3.7%. Among them, 1324 urinary calculi were seen. In detail, renal stone 509 (38.4%), ureteral stone 717 (54.2%), bladder stone 84 (6.4%), urethral stone 14 (1.1%). The tendency of upper urinary stone-wave was increasing gradually. Especially after 1965, it was increasing sharply. The tendency of lower's was stable. There was 15 urolithiasis in childhood in this duration. Most of them were upper urinary stone. 9 patients were under 5 years of age. The cause of urolithiasis was found in 9.5%. The upper urinary stone was found only 4.7% but, 57% was found in lower urinary stone. In this report, statistical studies of this work was compared and discussed with already published data in 1961 of our department.