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Table 1 Material and cycle characteristics between the two groups

From: Fresh versus frozen embryo transfer for full-term singleton birth: a retrospective cohort study

  Fresh-ET (N = 2059) FET(N = 2053) Z/χ2 P value
Age 29.4 ± 4.3 29.8 ± 4.2 −3.230 0.001
BMI 22.4 ± 3.0 23.3 ± 3.9 −6.252 0.000
Infertile years 3.6 ± 2.7 3.6 ± 2.8 −0.135 0.893
Infertile type    0.157 0.692
 Primary infertile 1189 (57.7) 1173 (57.1)   
 Secondary infertile 870 (42.3) 880 (42.9)   
Diagnosis of Infertile    1.590 0.662
 Tube factor 975 (47.4) 982 (47.8)   
 Male factor 505 (24.5) 503 (24.5)   
 Male+female 351 (17.0) 364 (17.7)   
 Other/unknown 228 (11.1) 204 (9.9)   
No. of embryos transfer 1.9 ± 0.4 1.9 ± 0.6 −2.165 0.030
Embryo stage    373.62 0.000
 D3 1855 (90.1) 1333 (64.9)   
 D5 204 (9.9) 720 (35.1)   
Delivery mode    86.116 0.000
 Vaginal 545 (26.5) 303 (14.8)   
 Caesarean 1514 (73.5) 1750 (85.2)   
Gestational weeks 39.0 ± 1.0 39.0 ± 1.1 −2.791 0.005
Offspring sex    0.524 0.469
 Male 1077 (52.3) 1097 (53.4)   
 Female 982 (47.7) 956 (46.6)