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Table 2 Pregnancy outcomes of FETs between immediate and delayed groups stratified by COS protocol

From: Delayed frozen embryo transfer failed to improve live birth rate and neonatal outcomes in patients requiring whole embryo freezing

 

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