Table 2.
Comparison of the clinical outcomes for cryopreserved‐thawed embryo transfer carried out in natural and hormone‐replacement cycles
| Natural cycle | Hormone‐replacement cycle | |
|---|---|---|
| No. chemical pregnancies | 371 | 73 |
| Chemical pregnancy rate per transfer cycle | 51.5% | 53.7% |
| No. clinical pregnancies | 310 | 55 |
| Clinical pregnancy rate per transfer cycle | 43.1% | 40.4% |
| Implantation rate | 29.5% | 28.0% |
| No. miscarriages | 45 | 13 |
| Miscarriage rate | 14.5% | 23.6% |
| No. ectopic pregnancies | 2 | 0 |
| No. ongoing pregnancies and deliveries | 263 | 42 |
| Ongoing pregnancy/delivery rate per transfer cycle | 36.5% | 30.9% |
| No. twin pregnancies | 23 | 3 |
| Twin pregnancy rate | 7.4% | 5.5% |
None of the differences between the two groups were statistically significant for any of the variables.