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Table 4 Demographic and IVF-FET cycle characteristics in monochorionic and dichorionic twining group

From: Monozygotic dichorionic-diamniotic pregnancies following single frozen-thawed blastocyst transfer: a retrospective case series

  Monochorionic Dichorionic P-value
(n = 29) (n = 14)
Age at IVF (years) 34.7 ± 4.5 35.4 ± 4.7 0.674
Body mass index (kg/m2) 22.4 ± 3.8 21.2 ± 2.4 0.301
Primary infertility 12 (41.4) 5 (35.7) 0.722
Fertilization method
 Conventional IVF 12 (41.4) 5 (35.7) 0.722
 ICSI 17 (58.6) 9 (64.3)  
Assisted hatching
 No 16 (55.2) 8 (57.1) 0.903
 Yes 13 (44.8) 6 (42.9)  
PGT
 No 17 (58.6) 8 (57.1) 0.927
 Yes 12 (41.4) 6 (42.9)  
Embryo day at transfer
 Day 5 23 (79.3) 12 (85.7) 0.613
 Day 6 6 (20.7) 2 (14.3)  
Endometrial preparation
 Natural cycle 2 (6.9) 1 (7.1) 0.976
 HRT or down-regulated 27 (93.1) 13 (92.9)  
Endometrial thickness in FET (mm) 9.0 ± 1.1 8.9 ± 1.4 0.856
  1. Data presented as mean ± SD or n (%)