Baby born per try. Not all embryos result in a delivered baby. Many fail to implant, and others miscarry. The live birth rate is the rate of children born after accounting for the loss of some embryos. The most common reason for embryo loss is aneuploidy, that is, loss of one or more chromosomes in the embryo.
Different. The pregnancy rate means the chances to get pregnant. The delivery rate, gives you the chance of getting pregnant and going home with a baby. If you have recurrent miscarriage, delivery rate may be more important to you, while if you have difficulty conceiving, the pregnancy rate may be your 1st focus. Obviously all are interested ultimately in the delivery rate.