[Epidemiology of cholelithiasis among professionally active persons in the Katowice province].

In the workplaces of the City of Katowice 2867 subjects in 5 age groups were studied by inquiry, physical examination and gallbladder ultrasonography. Calculi in the gallbladder were found in 344 subjects that is 11.99%. The prevalence of calculi was much higher in females, and in both sexes it increased with age. The study confirms the value of USG in the diagnosis of gallbladder calculi and the possibility of its use for screening of the general population.