Table 2.
Embryonic developmental in the experimental group
| Group | Fresh embryos(n) | Vitrified embryos(n) | Survival rate of vitrified embryos(%) | Re-vitrified embryos | Survival rate of re-vitrifiedembryos(%) | Expanded blastocystsn (%) | Total degeneration n (%) |
|---|---|---|---|---|---|---|---|
| 1 | 80 | - | - | - | - | 74(92.5) | 6(7.5) |
| 2 | 80 | 80 | 71(88.8a) | - | - | 71(88.8) | 9(11.2) |
| 3 | 80 | 80 | 74(92.2a) | - | - | 70(87.5) | (10) (12.5) |
| 4 | 80 | 80 | 72(90a) | 72 | 70(87.5a) | 66(82.9a) | 14(17.1a) |
| 5 | 80 | 80 | 69(87a) | 69 | 67(83.75a) | 65(81.7a) | 15(18.3 a) |
Group 1; Fresh embryos, Group 2; 8-cell vitrified embryos, Group 3; Early blastocyst stage vitrified embryos, Group 4; Vitrified at the 8-cell and re-vitrified at the compact stage, Group 5; Vitrified at the 8-cell stage and re-vitrified at the early blastocyst stage, and a; Significant difference with group 1 (P<0.05).