Embryo implantation in in vitro fertilization and intracytoplasmic sperm injection: impact of cleavage status, morphology grade, and number of embryos transferred.

Objective: The aims of this study were to compare preimplantation embryo quality in intracytoplasmic sperm injection (ICSI) with standard IVF and to examine the impact of age and number and quality of embryos transferred on implantation and pregnancy.

Design: Retrospective, controlled clinical study.

Setting: Academic tertiary center.