Table 1. Comparison of patients characteristics of the ≤EdB, HgB, and HdB groups.

Values are presented as number or number (%) unless otherwise indicated.

≤EdB group, included early, middle expanded, expanded and fully expanded blastocysts, but not the hatching form; HgB group, included hatching blastocysts, but not hatched blastocysts; HdB group, included completely hatched blastocysts; SE, standard error of the mean.