Incidence of Urolithiasis Leading to Hospitalization in Finland

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Abstract
The study population consists of 2304 urolithiasis patients discharge from all hospitals in 21 central hospital districts in 1970. The incidence rate was 50/100,000 inhabitants per yr, 74 for men and 27 for women. The age distribution resembles the Gaussian curve, with a peak between 45-49 yr for men and between 50-54 yr for women. The male/female ratio was 2.7 in the entire material, about 1 in the age group 0-24 yr, about 3 in the age group 25-74 yr and about 1.5 in patients 75 yr or older. The standardized incidence was highest in Southeastern Finland and in the archipelago of .ANG.land, and lowest in the coastal area of Southwestern Finland. In the area with high incidence, the age distribution of urolithiasis patients differed from that in the rest of the country; in the age groups over 40 the incidence of urolithiasis did not decrease. This difference was attributed to some lifelong environmental exposure. The standardized incidence of urolithiasis leading to hospitalization was higher among urban than rural residents. Seasonal variation in the hospital admissions for urolithiasis was not evident; temporal patterns of admissions were dissimilar in urban and rural areas and might reflect differences in the physical activities of urban and rural populations.

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