Although earlier data suggested that the pregnancy percentage decreases with oocyte numbers greater than 15-20 oocytes per retrieval ([29]), this is not true when additional FETs are included ([28]). 1987; 15: 245 - 51. 4 Vaegter KK, Lakic TG, Olovsson M, Berglund L, Brodin T, Holte J. Which factors are most predictive for live birth after in vitro fertilization and intracytoplasmic sperm injection (IVF/ICSI) treatments? Does local endometrial injury in the nontransfer cycle improve the IVF-ET outcome in the subsequent cycle in patients with previous unsuccessful IVF? 2018; 33: 58 - 64. 29 Sunkara SK, Rittenberg V, Raine-Fenning N, Bhattacharya S, Zamora J, Coomarasamy A. Association between the number of eggs and live birth in IVF treatment: an analysis of 400 135 treatment cycles. [Extracted from the article]