Main outcomes
We recorded the following outcomes: the number of oocytes retrieved, the
number of embryos obtained, the number of good quality embryos, clinical
pregnancy rate (a gestational sac with fetal heartbeat, confirmed by
ultrasound is defined as clinical pregnancy), the number of live births
(Live birth was defined as delivery of one or more living infants after
28 completed weeks of gestation), and the rate of miscarriage.