What is the success rate of IVF, and what factors influence it?

IVF success rates vary depending on several factors, including the woman's age, the cause of infertility, the clinic's experience, and the quality of the embryos. Generally, success rates decline with age. Live birth rates per cycle of IVF are often reported, and can range from around 30-40% for women under 35 to 10-20% for women over 40.