PCOS affects 6% to 8% of women of reproductive age in the US using the 1990 National Institutes of Health criteria, 7% to 13% of women using the Androgen Excess and PCOS Society criteria, and 8% to 13% of women using the 2003 Rotterdam criteria. The prevalence does not appear to vary across different regions of the world, as prevalence studies in Greece, Spain, and the UK reveal similar estimates. A questionnaire-based study suggested that Mexican-Americans, a group at high risk for insulin resistance and the metabolic syndrome, may have a higher prevalence of PCOS. One small preliminary study suggested a high rate of PCOS in indigenous Australians. There have been no prospective studies that document incidence rates for PCOS.
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