Table 1 Background and treatment characteristics of study participants according to endometrial preparation protocols
Parameter | tNC-FET group(n = 1783) | Programmed FET group(n = 550) | P |
|---|---|---|---|
Age (years) | 31.70 ± 4.10 | 30.49 ± 3.76 | 0.000 |
Infertility duration (years) | 4.30 ± 2.77 | 4.22 ± 2.57 | 0.570 |
BMI (kg/m2) | 23.05 ± 3.05 | 23.09 ± 3.17 | 0.538 |
Basal FSH(mIU/L) | 6.40 ± 3.15 | 5.95 ± 2.37 | 0.002 |
Basal LH(mIU/L) | 4.22 ± 2.50 | 6.63 ± 4.61 | 0.000 |
Cause of infertility, n (%) | |||
 Tubal factor | 36.1%(643/1783) | 24.5%(135/550) | 0.000 |
 Anovulation | 4.0%(71/1783) | 15.1%(83/550) | 0.000 |
 Diminished ovarian reserve | 1.9%(33/1783) | 0.9%(5/550) | 0.127 |
 Endometriosis | 1.4%(25/1783) | 0.7%(4/550) | 0.304 |
 Unexplained infertility | 4.8%(85/1783) | 3.1%(17/550) | 0.093 |
 Male factor | 16.9%(302/1783) | 7.8%(43/550) | 0.000 |
 Other | 35.0%(624/1783) | 47.8%(263/550) | 0.000 |
ART method, n (%) | |||
 IVF | 45.3%(807/1783) | 42.7%(235/550) | 0.296 |
 ICSI | 45.5%(811/1783) | 36.5%(201/550) | 0.000 |
 IVF + ICSI | 9.30%(165/1783) | 20.7%(114/550) | 0.000 |
 Endometrial thickness (mm) | 9.52 ± 1.66 | 9.19 ± 1.52 | 0.002 |
 No.embroy transfer | 1.81 ± 0.44 | 1.76 ± 0.44 | 0.570 |