The association between number of embryos transferred in average and poor-prognosis IVF patients, and the chances ofhaving good or poor IVF and perinatal outcomes, was investigated. Good IVF and perinatal outcome was defined as the birth of alive, term, normal-weight infant (≥2500 g)The odds of having good IVF and perinatal outcomes increased by 28% for each additional embryo transferred. The odds of poor IVF and perinatal outcomedecreased by 32% with an additional embryo transferred. The likelihood of live birth with good perinatal outcome in average- andpoor-prognosis patients after IVF increases with additional embryos being transferred. These data add to recently reported evidence in favour of multiple embryo transfer in older women and those with average or poor IVF prognosis
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