Table 5. Type and prevalence of birth defects in live born babies in the without-ER and ER groups.

ER, embryo retention; VSD, ventricular septal defect; PDA, persistent ductus arteriosus.

^a)Embryo transfer was successfully performed without retained embryos at the first attempt; ^b)Any retained embryos in the transfer catheter were found following the first attempt and retransferred immediately.