Have there been changes in percentages of transfers that resulted in live births among women who used fresh or frozen nondonor eggs or embryos?
Figure 52 presents percentages of transfers that resulted in live births for ART cycles using fresh nondonor eggs or embryos with or without ICSI and for cycles using frozen nondonor eggs or embryos. Percentages of transfers that resulted in live births are presented rather than percentages of cycles that resulted in live births because this is the only way to directly compare cycles using fresh embryos with those using frozen embryos. Overall, higher percentages of transfers that resulted in live births were consistently observed among fresh–nondonor cycles when compared with frozen–nondonor cycles. The percentage of transfers that resulted in live births for fresh–nondonor cycles performed without ICSI increased from 32% in 1998 to 37% in 2007. Over the same period, the percentage of transfers that resulted in live births for cycles using fresh nondonor embryos with ICSI remained slightly lower than those without ICSI, but steadily increased. The percentage of transfers that resulted
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