Fig. 1.

Percentage of embryos falling into optimal kinetic ranges. Optimal kinetic ranges were defined as: t3-t2 (> 5 and ≤ 11.9 h), t4-t3 (≤ 1 h), t5 (45–57 h), t5-t3 (9.7–21 h), tSB (< 96.2 h), and EB (≤ 116 h). Asterisk denotes p values that are statistically significant (< 0.05). Analysis performed using the chi-squared test. Abbreviations are as follows: tSB, timing of the start of blastulation; tEB, timing of expanded blastocyst