Table 1 Baseline characteristics and clinical data of all included patients
Characteristic | Fresh ET cycles | Total-FET cycles | p-value |
|---|---|---|---|
N | 638 | 3036 | |
Female age (y) | 32.30 ± 4.13 | 32.18 ± 4.39 | 0.556 |
Male age (y) | 34.81 ± 5.77 | 34.64 ± 5.36 | 0.325 |
History of infertility (y) | 3.56 ± 2.76 | 3.77 ± 2.29 | 0.785 |
Female BMI (kg/m2) | 21.36 ± 2.68 | 21.27 ± 3.13 | 0.946 |
Endometrial thickness during ET | 10.93 ± 2.11 | 9.29 ± 1.36 | 0.537 |
Number of embryos transferred | 1.89 ± 0.30 | 1.21 ± 0.40 | 0.039 |
Number of gestational sac by ultrasound | <0.001 | ||
1 | 439 | 2425 | |
2 | 196 | 597 | |
3 | 3 | 13 | |
4 | 0 | 1 | |
Number of live births | <0.001 | ||
1 | 426 | 2542 | |
2 | 120 | 422 | |
3 | 0 | 4 | |
During pregnancy | 80 | 0 | |
Middle and late stage abortion or induced labor / Stillbirth | 11 | 59 | |
Gender of live birth (single fetus) | 0.682 | ||
Male | 224 | 1367 | |
Female | 202 | 1175 | |
loss to follow-up | 1 | 9 | 0.603 |
Endometriosis | 0.069 | ||
Present | 163 | 258 | |
Absent | 475 | 2778 | |
Hypertensive disorders of pregnancy | |||
Present | 19 (11.9%) | 141 (17.6%) | 0.061 |
Absent | 619 (88.1%) | 2895 (82.4%) | |