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To examine the association between body mass index (BMI) and the outcome of in vitro fertilization or intracytoplasmic sperm injection embryo transfer\u2010 (IVF\/ICSI\u2010ET) assisted reproduction in women with polycystic ovary syndrome (PCOS) receiving the ultra\u2010long agonist protocol. <jats:italic>Methods<\/jats:italic>. We retrospectively identified all women receiving IVF\/ICSI\u2010ET for the first time using the ultra\u2010long protocol between January 2013 and January 2018 at our hospital. Only women at \u226435 years of age receiving the first cycle were analyzed. <jats:italic>Results<\/jats:italic>. A total of 1782 women were included in the analysis: 42 were underweight, 742 were overweight, 198 were obese, and 800 were normal weight. Gonadotropin dosage and duration were comparable between underweight and normal weight groups but were significantly higher\/longer in overweight and obese groups (<jats:italic>P<\/jats:italic> &lt; 0.008). The number of oocytes retrieved was significantly lower in overweight and obese groups than in the normal weight group (<jats:italic>P<\/jats:italic> &lt; 0.008). The number of transferable embryos was significantly higher in normal weight group than overweight and obese groups (<jats:italic>P<\/jats:italic> &lt; 0.008). Embryo implantation rate, clinical pregnancy rate, full\u2010term birth rate, and live birth rate did not differ among the 4 groups. The cycle cancellation rate was lower in the overweight and obese group than normal weight group (<jats:italic>P<\/jats:italic> &lt; 0.008). The miscarriage rate was higher in the obese group than the normal weight group (<jats:italic>P<\/jats:italic> &lt; 0.008). In multivariate logistic regression analysis, abnormal BMI was an independent risk for miscarriage (OR: 1.069, 95% CI 1.020, 1.122; <jats:italic>P<\/jats:italic> = 0.006). <jats:italic>Conclusion<\/jats:italic>. Overweight and obesity are associated with poor outcomes in PCOS patients receiving ultra\u2010long protocol. Measures to reduce body weight should be encouraged in overweight and obese PCOS women at \u226435 years of age prior to assisted reproductive technology (ART).<\/jats:p>","DOI":"10.1155\/2020\/6434080","type":"journal-article","created":{"date-parts":[[2020,8,24]],"date-time":"2020-08-24T23:33:24Z","timestamp":1598312004000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Association between Body Mass Index and Reproductive Outcome in Women with Polycystic Ovary Syndrome Receiving 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