About one in four attempts at in vitro fertilization results in a successful birth, according to the Fourth Annual Assisted Reproductive Technology [ART] Report, published by the Centers for Disease Control and Prevention. For women using their own eggs, age plays a pivotal role in success: those under 35 years fare best, with a 32% success rate, while women aged 40 and older successfully carried a fertilization attempt to term just 8% of the time. For women who opt for a donor egg—a much smaller group—the success rate is about 40%, regardless of age.
Vastag B. Fertility Treatment Statistics. JAMA. 2001;285(7):874. doi:10.1001/jama.285.7.874-JHA10001-2-1