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Table 2 Characteristics of patient and blastocyst morphology divided by clinical pregnancy

From: Blastocoele expansion: an important parameter for predicting clinical success pregnancy after frozen-warmed blastocysts transfer

Variable Clinical pregnancy (n = 434) Non-clinical pregnancy (n = 720) P-value
Female age(y) 30.68 ± 5.25 31.39 ± 5.70 0.034
Duration of infertility(y) 5.77 ± 2.94 5.63 ± 3.24 0.731
Type of infertility
 Primary infertility 215(49.5%) 303(42.1%)  
 Secondary infertility 219(50.5%) 417(57.9%) 0.140
No. of early cycles 2.66 ± 1.04 2.64 ± 1.07 0.794
Protocol of FET
 NC-FET 154(35.5%) 240(33.3%)  
 HRT-FET 220(50.7%) 407(56.5%)
 OI-FET 20(4.6%) 31(4.3%)
GnRH-a + HRT-FET 40(9.2%) 42(5.8%) 0.090
No. of blastocyst transferred 1.34 ± 0.48 1.39 ± 0.49 0.121
Endometrial thickness (mm) 9.65 ± 1.63 9.28 ± 1.64 0.000
Endometrial pattern
 A 123(28.3%) 187(26.0%)  
 B 280(64.5%) 479(66.5%)
 C 31(7.1%) 54(7.5%) 0.677
Blastocoele expansion 3.69 ± 0.68 3.53 ± 0.78 0.000
 1 5(0.9%)a,b,c,d 16(1.6%) a,b,c,d  
 2 21(3.6%)c,d 66(6.6%) c,d
 3 156(26.8%)b,d 345(34.5%) b,d
 4 373(64.0%)a 534(53.4%) a
 5 24(4.1%)a,b,c,d 28(2.8%) a,b,c,d
 6 4(0.7%)a,b,c,d 11(1.1%) a,b,c,d
ICM grade
 A 83(14.2%) 127(12.7%)  
 B 445(76.3%) 785(78.5%)
 C 55(9.4%) 88(8.8%) 0.594
TE grade
 A 96(16.5%) 148(14.8%)  
 B 416(71.4%) 694(69.4%)
 C 71(12.2%) 158(15.8%) 0.122
  1. Variables were present as mean ± SD, % or n
  2. ICM inner cell mass, TE trophectoderm
  3. For blastocoele expansion evaluation, groups (in the same columns) with the same letters have no significantly difference