Table II.
Cycle characteristics by type of transferred embryo
| Cycle characteristics |
Fresh emberyo transfer group
(n= 588) |
Frozen- thawed emberyo transfer group
(n= 426) |
p-value † |
|---|---|---|---|
| Assisted hatching n (%) † | |||
| Yes | 7 (1.2) | 6 (1.4) | 0.478 |
| No | 581 (98.8) | 419 (98.4) | |
| Grade of embryos (mean±SD) †† | |||
| A* | 1.4 ± 1.2 | 1.3 ± 1.1 | 0.414 |
| B** | 0.6 ± 0.9 | 0.7 ± 1.1 | 0.333 |
| A+B*** | 0.3 ± 0.7 | 0.4 ± 0.8 | 0.049 |
*:
A Blastomeres are equal, no fragmentation, clear sytoplasmic aspect and without subzonal space.
**:
B May be one blastomere is not equal, weak sytoplasmic aspect and without subzonal space, 5-10% fragmentation, and subzonal space may seen.
***:
A+ B The same as A and B.
†
The data were assessed using Chi-square test.
††
The data were assessed using t- test.