Urinary Tract Stone Disease in the United States Veteran Population. I. Geographical Frequency of Occurrence

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Abstract
The geographical distribution of hospitalization for urinary tract stone disease in the continental United States has been studied in the United States veteran population. The current study has been facilitated by the availability of a centralized computer data base containing the International Classification of Disease Codes for all hospital discharges at all Veterans Administration medical facilities. These data have allowed for an accurate mapping of the hospital discharge rate for urinary tract stone disease (stone discharge rate) in a population risk for urolithiasis. Stone discharge rate data have been compared to those from the 2 previous studies conducted in general hospitals in 1952 and 1974. The stone discharge rate was 7.9 .+-. 3.4 in 1952, 9.97 .+-. 2.82 in 1974 and 7.58 .+-. 2.01 in our study. These data indicate that the urinary tract stone discharge rate has not markedly varied during the last 34 years and also that the southeastern states still evidence the highest hospital discharge rate for urinary tract stone disease.