A multicenter, retrospective cohort observational study to evaluate the effectiveness and safety of fresh or frozen embryo transfer after ovarian hyperstimulation (administration of rFSH or HP-hMG alone or co-administration of rFSH and HP-hMG)

A multicenter, retrospective cohort observational study to evaluate the effectiveness and safety of fresh or frozen embryo transfer after ovarian hyperstimulation (administration of rFSH or HP-hMG alone or co-administration of rFSH and HP-hMG) to infertile female patients undergoing assisted reproductive technology to controlled ovarian hyperstimulation

Inclusion Criteria:

• First IVF-ET cycle patients

Exclusion Criteria:

Poor ovarian responder

- At least two of the following three features must be present: (i) Advanced maternal age (≥ 40 years) or any other risk factor for Poor ovarian response (POR); (ii) A previous POR (≤ 3 oocytes with a conventional stimulation protocol); (iii) An abnormal ovarian reserve test (i.e. AFC < 5-7 follicles or AMH < 0.5-1.1 ng/mL)

infertile female patients