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According to the Rotterdam 2003 criteria, an ovary is defined as polycystic if 12 or more follicles of 2-9 mm are present, when evaluating the ovary by ultrasonography on Days 3-5 of the menstrual cycle in women not using hormonal contraceptives. The aim of this population-based study was to estimate the prevalence of polycystic ovaries (PCO) in a representative sample of young Danish women according to the Rotterdam criteria.

A very large proportion of young Danish women have polycystic ovaries: is a revision of the Rotterdam criteria needed?