Change in the miscarriage rate, live birth rate per cycle started, or the multiple pregnancy rate.

流产率，已启动的周期活胎出生率或多胎妊娠率的变化。

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However, not all embryos survive the freezing and thawing process, and the live birth rate is lower with cryopreserved embryo transfer.

然而，在冷冻和复温的过程中，并非所有胚胎都能存活，冷冻胚胎移植的活胎出生率更低。

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If a program cites a live birth rate for each procedure, be sure that the program representative counts twins as one successful pregnancy, not two.

若方案有每次操作的活胎出生率，要明确方案表达的计数将双胎作为一次而不是两次成功的妊娠。

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Dr Mohamed Taranissi is director of the Assisted Reproduction and Gynaecological Centre in London - which has a live birth rate, as opposed to pregnancy rate of 40% - compared with a national average of 17 to 19%.

BBC: IVF 'fastest way to get pregnant'

The reason for this is improving health care, allowing people to live longer, coupled with a declining birth rate.

CNN: WHERE IT'S GOOD TO BE OLD

Scientists have cloned sheep, cows, goats, pigs and mice, but their success rate is as low as one live birth in 100 attempts.

CNN: Group says it will move human cloning work offshore