Purpose To evaluate if elevated male body mass influences success after assisted reproductive technologies Methods Retrospective study of 290 cycles. Results Male body mass index greater than 25.0 kg/m 2 was associated with significantly lower clinical pregnancy (53.2% vs. 33.6%). Multivariable logistic regression indicated that the likelihood of clinical pregnancy was decreased if the male partner was overweight after in vitro fertilization but not after intracytoplasmic sperm injection (odds ratios: 0.21 [0.07-0.69] vs. 0.75 [0.38-1.49], respectively) after adjustment for number of embryos transferred, sperm concentration, female age and body mass. Conclusion In this cohort, overweight status of the male partner was independently associated with decreased likelihood of clinical pregnancy after in vitro fertilization but not after intracytoplasmic sperm injection. A detrimental impact of higher male body mass was observed after adjusting for sperm concentration, suggesting that intracytoplasmic sperm injection may overcome some obesity related impairment of sperm-egg interaction.

Objective: Male adiposity is detrimental for achieving clinical pregnancy rate (CPR) following assisted reproductive technologies (ART). The hypothesis that the association of male adiposity with decreased success following ART is mediated by worse embryo quality was tested. Design and Methods: Retrospective study including 344 infertile couples undergoing in vitro fertilization (IVF) or intracytoplasmic sperm injection (ICSI) cycles was performed. Cycle determinants included number of oocytes retrieved, zygote PN-score, total number of embryos available on day 3, number of embryos transferred, composite day 3 grade for transferred embryos, composite day 3 grade per cycle, and CPR. Results: Couples with male body mass index (BMI) over 25 kg m À2 (overweight and obese) exhibited significantly lower CPR compared to their normal weight counterparts (46.7% vs. 32.0% respectively, P ¼ 0.02). No significant difference was observed for any embryo quality metrics when analyzed by male BMI: mean zygote PN-scores, mean composite day 3 grades for transferred embryos or composite day 3 grades per cycle. In a multivariable logistic regression analysis adjusting for female age, female BMI, number of embryos transferred and sperm concentration, male BMI over 25 kg m À2 was associated with a lower chance for CPR after IVF (OR ¼ 0.17 [95% CI: 0.04-0.65]; P ¼ 0.01) but not after ICSI cycles (OR ¼ 0.88 [95% CI: 0.41-1.88]; P ¼ 0.75). In this cohort, male adiposity was associated with decreased CPR following IVF but embryo quality was not affected. Conclusions: Embryo grading based on conventional morphologic criteria does not explain the poorer clinical pregnancy outcomes seen in couples with overweight or obese male partner.

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