title: Correlation between body mass index of Chinese males and assisted reproductive technology outcome.
abstract: OBJECTIVE
  To investigate the relationship between male's body mass index (BMI) and the outcome of assisted reproductive technology (ART). In this retrospective study, we analyzed the data from 729 cycles of female patients aged 38 years or less, with normal BMI and who received IVF treatments between January, 2013 and June, 2014. The patients were divided into normal weight (n = 358), overweight (n = 267), and obese (n = 104) groups according to the BMI of their male partners. Embryonic development and pregnancy outcomes in these three groups were compared.
  
  
  RESULTS
  With increasing BMI, fertilization rates decreased proportionately (P < 0.05); but embryonic cleavage rates and effective embryo rates were not significantly affected (P > 0.05). There was no significant difference in implantation rates, pregnancy rates, or early miscarriage rates (P > 0.05) among the three groups.
  
  
  CONCLUSIONS
  High male BMI affects fertilization rate with ART; and we recommend that men of reproductive age adjust their lifestyles accordingly and make efforts to control their weight.
authors.affiliation: Reproductive Medical Center, International Peace Maternity and Child Health Hospital Affiliated, Shanghai Jiao Tong University Shanghai, China.
authors.forename: Zhengmu
authors.initials: Z
authors.lastname: Wu
authors.affiliation: Reproductive Medical Center, International Peace Maternity and Child Health Hospital Affiliated, Shanghai Jiao Tong University Shanghai, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Lu
authors.affiliation: Reproductive Medical Center, International Peace Maternity and Child Health Hospital Affiliated, Shanghai Jiao Tong University Shanghai, China.
authors.forename: Min
authors.initials: M
authors.lastname: Wang
authors.affiliation: Reproductive Medical Center, International Peace Maternity and Child Health Hospital Affiliated, Shanghai Jiao Tong University Shanghai, China.
authors.forename: Huaijin
authors.initials: H
authors.lastname: Cheng
keywords: Obesity; assisted reproductive technology; infertility; pregnancy outcome