Preliminary data for 2020 indicate that in the US, the cumulative chances of a live birth for each oocyte retrieval (counting all transfers of the patient's own embryos—both fresh and frozen-thawed) was 44.6% for women < 35 (6.6% were twins; 0.2% were triplets or more) and 9.7% for women aged 41 to 42 (3).