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The clinical outcome of slow freezing and vitrification
| Parameters | Slow freezing | Vitrification | P-value |
|---|---|---|---|
| Cryopreserved embryos per patient | 5.5 ± 3.2 | 6.1 ± 3.6 | 0.351 |
| No. of embryos thawed per cycle | 2.9 ± 0.9 | 2.6 ± 0.7 | 0.001 |
| Embryo survival rate (%) | 343/460(74.6) | 733/825(88.5) | <0.001 |
| Intact embryos rate (%) | 294/460(63.9) | 714/825(86.6) | <0.001 |
