Table 6.
Comparison of ER between the two groups
| Parameters | Mirena group (n = 81) | Mirena combined with Leuprorelin group (n = 63) | t/χ2 | P |
|---|---|---|---|---|
| Endometrial thickness on ovulation day (mm) | 9.21 ± 2.32 | 8.23 ± 1.19 | 3.301 | 0.001 |
| Type A endometrium in ovulation | 17 (20.99%) | 23 (36.51%) | 4.255 | 0.039 |
| Uneven myometrial structure | 20 (24.69%) | 7 (11.11%) | 4.290 | 0.038 |
| Pulsatility index of uterine artery > 3 | 16 (19.75%) | 5 (7.94%) | 3.972 | 0.046 |
| Diastolic notch or deficiency of end diastolic blood flow | 10 (12.35%) | 1 (1.59%) | 4.389 | 0.036 |
| Endometrial-subendometrial blood flow (counts of vessels) | 8.49 ± 3.71 | 10.18 ± 3.34 | 2.834 | 0.005 |
| Salle score | 14.41 ± 3.02 | 16.27 ± 2.63 | 3.887 | < 0.001 |
ER: endometrial receptivity; Salle score: a scoring system for assessing endometrial receptivity.