Table 2.
Pregnancy outcomes of FETs between immediate and delayed groups stratified by COS protocol
| GnRHa protocol | GnRHant protocol | |||||
|---|---|---|---|---|---|---|
| Immediate FET (n = 1585) |
Delayed FET (n = 1525) |
P value | Immediate FET (n = 778) |
Delayed FET (n = 516) |
P value | |
| Implantation rate | 45.7 (1245/2727) | 45.1 (1241/2753) | 0.668 | 45.7 (1245/2727) | 45.1 (1241/2753) | 0.668 |
| Clinical Pregnancy rate | 60.4 (957/1585) | 59.7 (911/1525) | 0.715 | 62.7 (488/778) | 61.8 (319/516) | 0.743 |
| Multiple pregnancy rate | 31.7 (303/957) | 35.1 (320/911) | 0.112 | 31.8 (155/488) | 36.4 (116/319) | 0.176 |
| Monozygotic twins rate | 2.4 (23/957) | 2.5 (23/911) | 0.866 | 2.0 (10/488) | 1.9 (6/319) | 0.867 |
| Early spontaneous miscarriage rate | 14.8 (142/957) | 13.0 (118/911) | 0.239 | 12.1 (59/488) | 12.9 (41/319) | 0.748 |
| Spontaneous miscarriage rate | 16.6 (159/957) | 14.7 (134/911) | 0.258 | 15.8 (77/488) | 15.4 (49/319) | 0.873 |
| Ectopic pregnancy rate | 1.6 (15/957) | 1.5 (14/911) | 0.957 | 1.6 (8/488) | 2.2 (7/319) | 0.568 |
| Live birth rate | 48.6 (771/1585) | 48.8 (744/1525) | 0.936 | 51.2 (398/778) | 51.0 (263/516) | 0.947 |