The cycle overflow probability is just the proportion of cycles with occupied detector at end of green time phases.
A high proportion of cycles (62%) were performed in women who were aged 40 years or more.
28 Another advantage to this strategy is the increase in the proportion of cycles where supernumerary embryos are available for cryopreservation.
As a result of transferring fewer embryos, the proportion of cycles achieving cryopreservation of surplus embryos increased from 22% (267/1198) to 28% (341/1224, RD = 6%, RR 1.3, 95% CI 1.09 1.44, P = 0.0015).
As a result of transferring fewer embryos, the proportion of cycles where surplus oocytes or embryos were cryopreserved improved significantly from 42% (677/1609) to 57% (325/574), respectively (P < 0.01).
Moreover, McNemar's test was used to test whether the proportion of cycles (on a per woman basis) where at least one of the three oocytes successfully fertilized, was equal for both groups.
Although some women chose to use BBT as an additional sign in a large proportion of cycles (39%), we did not find any evidence that use of BBT improved accuracy.
A chi squared statistic was used to test for differences in the annual proportion of cycles undertaken by women before the EMSNCap (2007-2009) withethe first year after the EMSNCap (2010).
By replacing fewer embryos, and at a stage where quality is deemed to be better, it is likely that a larger proportion of cycles would have surplus embryos suitable for cryopreservation.
