title: Prevalence of gallstone disease in Iran.
abstract: BACKGROUND
  Prevalence of gallstone disease is different depending on the geographic region involved. Few studies, in Asia but not from Iran, about the frequency of gallstone disease have been published. The aim of this study is to examine the prevalence of gallstone disease in Iran.
  
  
  METHODS
  Four hundred and seventy-seven nomads from southern Iran, 513 industrial laborers older than 34 years, and 421 laborers from a pharmaceutical company above 30 years of age, and 471 elderly persons from three nursing homes near Tehran underwent abdominal sonography.
  
  
  RESULTS
  There were 1373 men and 509 women. Eighty-nine subjects had gallstone disease and 10.1% of them were cholecystectomized. While the prevalence in the men and women in the age group 31-40 years was very low (0.3% in men and 1.8% in women), it increases sharply in men older than 60 years and women older than 50 years to more than 10-fold (12.5 and 24.6% in male and female with an age 71-80 years, respectively).
  
  
  CONCLUSIONS
  In Iran, gallstone disease is very uncommon in middle-aged people, but increases sharply in older people. However, this does not reach the high prevalence seen in Western countries. The intake of a high fiber-containing diet, a low number of overweight people, smoking habit and hyperlipidemia are probably the cause for this low prevalence.
authors.affiliation: Department of Gastroenterology and Digestive Research Center, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran. massarrat@ams.ac.ir
authors.forename: S
authors.initials: S
authors.lastname: Massarrat
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002769:Cholelithiasis / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007492:Iran / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D015995:Prevalence