Pregnancy and perinatal outcomes in women with polycystic ovary syndrome and twin births: a population‐based cohort study

Objective To investigate pregnancy and perinatal outcomes in twin births among women with and without polycystic ovary syndrome ( PCOS ) diagnosis. Design Population‐based cohort study. Setting Sweden. Population We identified 20 965 women with twin births between 1995 and 2009 of whom 226 had a PCOS diagnosis through linkage between the Swedish Medical Birth Register and the Swedish National Patient Register. Methods Calculating risk ratios (...