Table 4.
Comparison of cycle characteristics between the two groups
| Group 1 | Group 2 | P | |
|---|---|---|---|
| Number | 421 | 999 | |
| E2 on the day of P administration start (pg/ml) | 266.83 ± 364.02 | 295.34 ± 283.83 | 0.767 |
| P on the day of P administration start (ng/ml) | 0.90 ± 1.85 | 0.73 ± 0.93 | 0.006 |
| EMT on the day of P administration start (mm) | 10.52 ± 1.71 | 9.55 ± 1.62 | 0.185 |
| Endometrial pattern on the day of P administration start | |||
| A endometrium on the day of P administration start (%) | 72.9% (307/421) | 79.5% (794/999) | 0.007 |
| B endometrium on the day of P administration start (%) | 25.2% (106/421) | 20.1% (201/999) | 0.034 |
| C endometrium on the day of P administration start (%) | 1.9% (8/421) | 0.4% (4/999) | 0.005 |
| E2 on embryo transfer day (pg/ml) | 257.88 ± 219.15 | 316.42 ± 304.95 | 0.001 |
| P on embryo transfer day (ng/ml) | 10.66 ± 6.05 | 10.54 ± 6.27 | 0.976 |
| EMT on embryo transfer day (mm) | 9.11 ± 1.48 | 10.17 ± 1.67 | 0.016 |
| Endometrial pattern | |||
| A endometrium on embryo transfer day (%) | 1.4% (6/421) | 0.7% (7/999) | 0.190 |
| B endometrium on embryo transfer day (%) | 27.8% (117/421) | 29.0% (290/999) | 0.637 |
| C endometrium on embryo transfer day (%) | 70.8% (298/421) | 70.3% (702/999) | 0.846 |
| Days of estrogen administration before P | 11.93 ± 3.34 | 11.85 ± 3.32 | 0.644 |