Compared with the two groups of infertility patients making use of oocyte cryopreservation, women cryopreserving oocytes for fertility preservation were significantly older at the times of both vitrification and warming.
This difference was expected, because fertility preservation was specifically directed toward women in their mid- 30s (slightly older than the average infertility patient), who were believed to have the greatest potential to benefit from elective oocyte
cryopreservation.
The oocytes of elective fertility preservation patients were also cryopreserved for a longer duration than those of infertility patients. Again, this was expected given the different reasons for oocyte cryopreservation.