The Effect of Freezing Twice during Assisted Reproductive Technology on Perinatal and Neonatal Outcomes
Table 2
Baseline characteristics after propensity score matching.
Characteristic
Study group
Control group
value
Age (years)
29 (26-31)
28 (26-31)
0.586
BMI (kg/m2)
22.781 (19.995-25.038)
22.609 (20.355-25.596)
0.773
FSH (IU/L)
5.84 (4.98-7.038)
5.96 (5.11-6.87)
0.694
LH (IU/L)
5.175 (3.783-7.325)
5.25 (3.965-6.975)
0.818
Number of oocytes retrieved
19 (14-28)
20 (15-25)
0.983
PCOS (%)
23 (23.96)
73 (19.8)
0.895
Regimen of endometrial preparation for FET
0.827
Natural cycles
35 (36.46)
146 (39.6)
Programmed cycles
43 (44.79)
161 (43.6)
Ovarian stimulation cycles
18 (18.75)
62 (16.8)
Number of transferred embryos
0.983
1
85 (88.54)
327 (88.6)
2
11 (11.46)
42 (11.4)
Endometrial thickness on HCG trigger day (cm)
1 (0.9-1.1)
1 (0.85-1.1)
0.897
Previous conception
23 (23.96)
78 (21.1)
0.551
Values are the median (interquartile range) or number (percentage). aStatistically significant. BMI: body mass index; FSH: follicle stimulating hormone; LH: luteinizing hormone; PCOS: polycystic ovary syndrome; FET: frozen embryo transfer; HCG: human chorionic gonadotropin.
