Table 1.
Basal characteristics of participants.
| Control group | hCG group | P value | |
|---|---|---|---|
| Number | 238 | 216 | |
| Age (yr) | 34.1 ± 4.7 | 34.6 ± 4.5 | .182 |
| AMH (ng/mL) | 3.7 ± 1.8 | 3.7 ± 1.6 | .938 |
| BMI (kg/m2) | 24.1 ± 3.9 | 23.7 ± 4.1 | .303 |
| Infertility years (yr) | 2.9 ± 1.3 | 2.8 ± 1.5 | .660 |
| Basal FSH (U/L) | 6.5 ± 2.1 | 6.7 ± 2.0 | .245 |
| Basal LH (U/L) | 5.1 ± 2.5 | 5.3 ± 3.0 | .532 |
| Basal E2 (pg/mL) | 45.8 ± 24.8 | 48.4 ± 28.6 | .306 |
| Basal P (ng/mL) | 0.6 ± 0.3 | 0.6 ± 0.3 | .453 |
| Primary or secondary infertility | .287 | ||
| Primary infertility | 46.6% (111/238) | 41.7%(90/216) | |
| Secondary infertility | 53.4% (127/238) | 58.3%(126/216) | |
| Duration of stimulation | 10.7 ± 1.9 | 10.6 ± 1.9 | .851 |
| Gn dosage | 2275.7 ± 682.4 | 2278.9 ± 672.1 | .959 |
| Number of oocytes obtained | 11.7 ± 3.2 | 11.8 ± 3.1 | .883 |
| Number of transferrable embryo | 6.1 ± 2.0 | 6.2 ± 2.0 | .859 |
| Transfer of embryo or blastocyst | .256 | ||
| Embryo | 72.7% (173/238) | 77.3% (167/216) | |
| Blastocyst | 27.3%(65/238) | 22.7% (49/216) | |
| Total number of transfers | .126 | ||
| First FET transfer after fresh embryo transfer | 73.5%(175/238) | 79.6% (172/216) | |
| Two or more FET transfer after fresh embryo transfer | 26.5%(63/238) | 20.4% (44/216) |
AMH = anti-Müllerian Hormone, BMI = body mass index, E2 = estrogen, FET = frozen-thawed embryo transfer, FSH = follicle-stimulating Hormone, Gn = gonadotrophin, LH = luteinizing hormone, P = progesterone.