Embryological and clinical outcome of the studied group.

Abbreviations: Studied group: ‘one follicle—one retrieved oocyte—one resulting embryo’ FF group; COC: cumulus-oocyte-complex; M2: mature metaphase II oocyte; M1: immature metaphase I oocyte; GV: germinal vesicle; Z1, 2, 3: zygote grading according to Scott et al. [25]

†: 4 zygotes assessed as Z4 not included; Class A, B, C: embryo grade according to internal laboratory embryo score standards on the third day of the culture [26]

#: 40 zygotes were arrested in development; pregnancy rate: defined as USG viable fetus; implantation rate: defined as percentage of implanted embryos compared to the number of transferred embryos; D3: third day of culture, D5: fifth day of culture.

Embryological and clinical outcome of the studied group.