Table 1 Demographic characteristics of frozen-thawed SBT cycles grouped according to D3 cell numbers
Characteristics | Group A (n = 130) | Group B (n = 621) | Group C (n = 328) | Group D (n = 65) | P value |
|---|---|---|---|---|---|
Maternal age(years), median (IQR) | 30.0 (27.8, 32.0) | 29.0 (27.0, 31.0) | 29.0 (27.0, 31.0) | 29.0 (28.0, 31.0) | 0.182 |
Duration of infertility (years) | 3.0 (2.0, 5.0) | 3.0 (2.0, 4.0) | 3.0 (2.0, 4.0) | 3.0 (2.0, 5.0) | 0.862 |
Maternal BMI (kg/m²) | 20.5 (18.7, 22.9) | 20.8 (19.1, 22.9) | 21.0 (19.1, 22.8) | 21.2 (19.3, 24.7) | 0.255 |
AMH (ng/mL) | 6.3 (3.4, 9.8) | 6.9 (4.3, 10.6) | 7.2 (4.2, 10.8) | 5.6 (3.6, 8.7) | 0.059 |
FSH (mIU/mL) | 6.6 (5.8, 7.8) | 6.5 (5.5, 7.6) | 6.6 (5.5, 7.5) | 6.2 (5.3, 8.2) | 0.394 |
LH (mIU/mL) | 5.6 (3.8, 8.5) | 5.2 (3.7, 7.3) | 5.4 (3.9, 7.7) | 5.5 (4.0, 9.8) | 0.321 |
E2 (pg/mL) | 42.5 (31.0, 59.0) | 43.0 (32.0, 54.0) | 44.0 (33.0, 58.0) | 46.0 (35.0, 59.0) | 0.334 |
P (pg/mL) | 0.6 (0.4, 0.9) | 0.6 (0.39, 0.83) | 0.6 (0.4, 0.8) | 0.6 (0.4, 0.9) | 0.886 |
Fertilization | < 0.01 | ||||
IVF | 81.5 (106/130) | 83.9 (521/621) | 90.5 (297/328) | 96.9 (63/65) | |
ICSI | 18.5 (24/130) | 16.1 (100/621) | 9.5 (31/328) | 3.1 (2/65) | |
Endometrium thickness (mm) | 9.0 (8.2, 10.2) | 9.0 (8.3, 10.0) | 9.0 (8.4, 10.0) | 9.0 (8.6, 10.2) | 0.498 |
Endometrial preparation (%) | 0.072 | ||||
Natural cycle | 92.3 (120/130) | 95.3 (592/621) | 97.3 (319/328) | 98.5 (64/65) | |
HRT cycle | 7.7 (10/130) | 4.7 (29/621) | 2.7 (9/328) | 1.5 (1/65) | |
High-quality blastocyst rate (%) | 57.7 a (57/130) | 87.8 b (545/621) | 91.2 b (299/328) | 92.3 b (60/65) | < 0.01 |
Frozen time (months), median (IQR) | 3.0 (2.0,4.0) | 3.0 (2.0,3.0) | 3.0 (2.0,4.0) | 3.0 (2.0,4.0) | 0.206 |