Pregnancy complications in women with polycystic ovary syndrome. importance of diagnostic criteria or of phenotypic features?

Sir, We read with great interest the retrospective matched cohort study recently published in Human Reproduction by Kollmann et al. (2015) aimed to evaluate the prevalence of adverse maternal and neonatal outcomes in different populations of women with polycystic ovary syndrome (PCOS) diagnosed according to the three main recommendations of the National Institute of Health (NIH), of the European Society of Human Reproduction and Embryology (ESHRE)/American Society of Reproductive Medicine (ASRM) and of the Androgen Excess and PCOS Society (AE-PCOS). A high prevalence of pregnancy complications was observed in all PCOS populations, irrespectively from the criteria adopted to diagnose the PCOS.