Abstract: Objective To explore the relationship between body mass index (BMI) and clinical outsomes of in vitro fertilization
and embryo transfer (IVF/ICSI-ET) cycles in patients with endometriosis. Methods We retrospectively analyzed the data of
infertile women with endometriosis undergoing 244 IVF/ICSI-ET cycles between January, 2011 and August, 2012. The patients,
categorized into 3 groups with mild endometriosis, moderate to severe endometriosis, and no endometriosis (control),
underwent a long protocol, and the relationship of the general conditions, dose of gonadotropin, days of stimulation, BMI,
number of oocytes retrieved and embryos transferred with the outcome of IVF were analyzed. Results There was significant
difference between moderate to severe endometriosis group and the control group in the number of ampules, oocytes
retrieved and embryos transferred. The patients with moderate or severe endometriosis had significantly lower BMI and
clinical pregnancy rate than those with mild or no endometriosis. Conclusion Endometriosis is inversely correlated with BMI,
and BMI of the patients with endometriosis may affect the pregnancy rate of IVF cycles.