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.[7][8][9] 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.[10][11][12] 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.[13] One small preliminary study suggested a high rate of PCOS in indigenous Australians.[14] There have been no prospective studies that document incidence rates for PCOS.

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