According to strict diagnostic criteria, about 0.3% of people in westernised countries, with about 0.5% to 1% of college-aged women, are affected. One national comorbidity survey of several thousands of US households found lifetime prevalence estimates of AN to be 0.9% for females and 0.3% for males. It is estimated that 3 in 10 patients are male, but many males may not present for treatment; thus, about 90% of patients diagnosed are female.
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