Potential confounding factors included in the model were: An associated male infertility, a prior history of surgery for endometriosis, AMH level (≤ 1.5ng/ml versus >1.5 ng/ml), the type of stimulation protocol, the total dose of the injected gonadotropin (IU), the type of ET (fresh versus Def-ET), and the number of oocytes retrieved. This evidence concerns the gene AMH and male infertility.