I believe "blastocyst utilisation" was the endpoint of the study. A blastocyst is the "ball" of dividing cells that forms soon after fertilisation. Each blastocyst is analysed for "normal development" and graded for potential use in IVF. In the trial, i assume "no adverse events" occurred in relation to blastocyst development (meaning no unexpected or unintended outcomes). .......and probably no broken wrists occurred either.
(20min delay)