Table 2 Comparison of pregnancy outcomes between groups divided by serum estrogen levels on the endometrium transformation day [% (n/n)].

A₁

75.6 (133/176)

62.8 (221/352)

50.0 (88/176)

9.0 (12/133)

68.8 (121/176)

A₂

70.8 (126/178)

52.8 (188/356)

36.0 (64/178)

11.1 (14/126)

62.4 (111/178)

A₃

77.8 (137/176)

59.4 (209/352)

40.9 (72/176)

14.6 (20/137)

66.5 (117/176)

A₄

69.7 (124/178)

50.0* (178/356)

32.6* (58/178)

11.3 (14/124)

60.7 (108/178)

χ²

4.101

14.864

12.696

2.112

3.184

p

0.251

0.002

0. 005

0.550

0.364