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Page: Epidemiology
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The incidence of Crohn's disease has been ascertained from population studies in Norway and the United States and is similar at 6 to 7.1:100,000. Crohn's disease is more common in northern countries, and shows a higher preponderance in northern areas of the same country.[49] The incidence of Crohn's disease in North America is 6:100,000, and is thought to be similar in Europe, but lower in Asia and Africa. It also has a higher incidence in Ashkenazi Jews.
Crohn's disease has a bimodal distribution in incidence as a function of age: the disease tends to strike people in their teens and twenties, and people in their fifties through seventies. It is rare in early childhood. There is no association with gender, social class or occupation. Parents, siblings or children of people with Crohn's disease are 3 to 20 times more likely to develop the disease. Twin studies show a concordance of greater than 55% for Crohn's disease.
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