Table III.
Blastocyst grade between the experimental and control groups.
| Grade | Y-27632 (n=26) n (%) | Control (n=44) n (%) | P-value |
|---|---|---|---|
| Blastocyst | |||
| 3 | 10 (38.5) | 10 (22.7) | 0.159 |
| 4 | 14 (53.8) | 28 (63.6) | 0.419 |
| 5 | 2 (7.7) | 6 (13.6) | 0.714 |
| 6 | 0 | 0 | – |
| Inner cell mass | |||
| A | 4 (15.4) | 4 (9.1) | 0.681 |
| B | 9 (34.6) | 16 (36.5) | 0.882 |
| C | 13 (50.0) | 24 (54.6) | 0.712 |
| Trophectoderm | |||
| A | 4 (15.4) | 10 (22.7) | 0.458 |
| B | 12 (46.2) | 19 (43.2) | 0.809 |
| C | 10 (38.5) | 15 (34.1) | 0.712 |
Grade 1, early blastocyst with blastocoel less than 50% of the volume; grade 2, early blastocyst with blastocoel occupying 50–80%; grade 3, non-expanded blastocyst with large blastocoel; grade 4, expanded blastocyst; grade 5, the blastocyst has started to hatch; grade 6, the blastocyst is completely hatched. Inner cell mass grade: A, high number of tightly packed cells; B, few cells and loosely packed; C, almost no cells. Trophectoderm grade: A, high number of cells; B, few cells; C, almost no cells.