[Regional differences in the use of cholecystectomy in Denmark during the period 1977-1985].

In a register-based study of all cholecystectomized patients in Denmark during the period from 1977-85 (37,048 patients) an account is given of the regional variations observed in connection with the intervention. The cholecystectomy operation is sub-divided into four types of operation dependent on whether the intervention is merely a matter of cholecystectomy or it involves the choledocus, the duodenum, the small intestine or other organs. The variation analysis is based on a division of the country into 75 areas, each primarily served by a single hospital. The method highly reflects the differences in clinical treatment strategies. The summarized rate of cholecystectomy for this period of time was 8.2 per 10,000 persons. In areas with the highest and the lowest rates of operation the figures were 12.3 per 10,000 and 5.1 per 10,000, respectively. In 18 areas, the rates of operation were significantly higher than average and in 18 other areas significantly higher than average and in 18 other areas significantly below average. SCV-score (X100) 2.19. There is no systematic correlation between the degree of specialisation in the operating department and the frequency in employing the operation. Areas with an operation index significantly above average had the same rate of more complicated operations than simple cholecystectomy as the other areas. Possible causes of national as well as international variations in the use of cholecystectomy are discussed, and the need for a radical evaluation of this kind of treatment is emphasized.