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Aim
The purpose of the study was to establish a mathematical model to help rank the order of blastocysts and assist selection of which blastocysts to warm in vitrified‐thawed embryo transfer cycles.
Design
A total of 2862 women who underwent first vitrified‐thawed single blastocyst transfer (SBT) between July 2015 and July 2019 were retrospectively recruited and randomized into a training set (...