Table III.
Demographic data showing the timing to development in embryos developing into blastocysts or that arrested. Time was counted from thawing of the embryos.
| Arrested embryos n = 17 |
Blastocysts n = 30 |
P value | |||
|---|---|---|---|---|---|
| n | median h (range) | n | median h (range) | ||
| Time to first cleavage | 16 | 18.0 (3.1–36.9) | 30 | 11.8 (3.1–35.4)b | 0.067 |
| Time to morula | 10 | 61.6 (46.4–78.9) | 29 | 51.4 (31.3–72.1)** | 0.008 |
| Time to start of cavitation | 5 | 83.9 (75.3–94.2) | 30 | 63.0 (42.4–79.4)*** | 0.001 |
| Time to start of expansion | 2 | 88.3 (86.6–90.0) | 30 | 71.2 (47.9–88.1)a | 0.029 |
| Time to start of hatching | 8 | 87.2 (70.6–94.1) | N/A | ||
**
P < 0.01 compared with arrested embryos, Mann–Whitney U test.
***
P < 0.001 compared with arrested embryos, Mann–Whitney U test.
a
Owing to the low number of arrested embryos that started to expand, the significant difference in time to this stage is not noted.
b
Tendency.