AN is considered to be a rare illness. The prevalence even in high-risk groups and high-risk situations is approximately 0.5%-1%. Partial disorders (diagnosed when symptoms are present, but do not meet the full criteria as established in the DSM) are more commonly seen in psychological practice. The incidence (number of new cases) of AN has increased during the last 50 years due to increased societal concerns regarding body shape, weight, and appearance. Some occupations such as ballet dancing and fashion modeling may predispose persons to develop AN, due to preoccupation with physical appearance. This disorder usually affects women more than men in a ratio of between one to 20 and one to 10.
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