Association between blastocyst morphology and live birth rate following frozen-thawed single blastocyst transfer: Results from a 5-year retrospective analysis of 2593 cryopreserved blastocysts.

The timing of blastulation and all blastocyst morphology parameters were associated with LBR independently. Although the most important parameter for predicting clinical outcomes remains undetermined, the timing of blastulation was a stable predictor of live birth for frozen-thawed SBT.