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As an attempt to evaluate the influence of various external factors to the formation of urinary stone, age, sex, resident area, level of education, smoking, daily amount of water drinking and past history of all patients admitted to the Department of Urology, Severance Hospital, Yonsei Univereity, from November, 1970 to October, 1971 were studied according to the designed questionaires. Prevalence rates of urinary stone cases were obtained against total number of patients admitted by the various epidemiological factors. The results are summarized briefly as follows: 1. Prevalence rate of the urinary stone by sex was somewhat higher in female than in male. 2. Urinary stone was most prevalent in the age of 21~40 and bladder stones were seen in the middle and older age groups among male 3. The hot weather from July to October showed the highest rates in prevalence and the cold weather from December to March showed the lowest prevalence rates. 4. Urinary stone was more prevalent among intellectuals or among high level of education. 5. Urinary stones were more prevalent among residents in the large city than the residents in the middle city or rural area. 6. Smoking seemed to be not related to the stone formation. 7. The prevalence rate of urinary stone was related to the water drinking. 8. Patient with history of immobilization had more prevalence rate than those without history of immobilization.
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