Table 1 Comparison of baseline characteristics between the two groups before and after PSM
Characteristic | Before PSM | After PSM | ||||
|---|---|---|---|---|---|---|
GnRH-a (n = 310) | AC-FET (n = 4193) | P-value | GnRH-a (n = 309) | AC-FET (n = 1207) | P-value | |
Maternal age (years) | 30.11 (3.76) | 29.17 (3.56) | < 0.001 | 30.07 (3.69) | 29.93 (3.62) | 0.564 |
Number of FET cycles | < 0.001 | 0.755 | ||||
1 | 182 (58.7) | 2987 (71.2) | 181 (58.6) | 735 (60.9) | ||
2–3 | 118 (38.1) | 1141 (27.2) | 118 (38.2) | 434 (36.0) | ||
> 3 | 10 (3.2) | 65 (1.6) | 10 (3.1) | 38 (3.1) | ||
BMI (kg/m2) | 23.09 (3.66) | 23.19 (3.61) | 0.639 | 23.08 (3.66) | 23.02 (3.42) | 0.783 |
Infertility type | 0.451 | 0.696 | ||||
Primary | 197 (63.5) | 2753 (65.7) | 196 (63.4) | 780 (64.6) | ||
Secondary | 113 (36.5) | 1440 (34.3) | 113 (36.6) | 427 (35.4) | ||
Endometrial thickness(mm) on the day before ET | 9.79 (1.77) | 9.32 (1.66) | < 0.001 | 9.77 (1.74) | 9.78 (1.75) | 0.778 |
Embryo stage at transfer | 0.042 | 0.779 | ||||
Cleavage stage | 54 (17.4) | 558 (13.3) | 53 (17.2) | 199 (16.5) | ||
Blastocyst | 256 (82.6) | 3635 (86.7) | 256 (82.8) | 1008 (83.8) | ||
Number of embryos transferred | 0.402 | 0.734 | ||||
1 | 55 (17.7) | 826 (19.7) | 55 (17.8) | 205 (17.0) | ||
2 | 255 (82.3) | 3367 (80.3) | 254 (82.2) | 1002 (83.0) | ||
Number of high-quality embryos transferred | 0.104 | 0.722 | ||||
0 | 72 (23.2) | 1188 (28.3) | 71 (23.0) | 299 (24.8) | ||
1 | 93 (30.0) | 1260 (30.1) | 93 (30.1) | 370 (30.7) | ||
2 | 145 (46.8) | 1745 (41.6) | 145 (46.9) | 538 (44.6) | ||
Baseline hormonal profile at the beginning of AC-FET | ||||||
FSH (IU/l) | 6.44 (1.89) | 6.37 (1.70) | 0.504 | 6.43 (1.89) | 6.40 (1.70) | 0.792 |
LH (IU/l) | 6.86 (4.23–10.35) | 7.20 (4.54–11.45) | 0.182 | 6.83 (4.23–10.31) | 6.89 (4.36–10.60) | 0.800 |
E2 (pg/mL) | 49.00 (35.00–63.00) | 49 (37.00–63.00) | 0.695 | 49 (35.00–63.00) | 48 (36–61) | 0.610 |
P(ng/mL) | 0.61 (0.40–0.96) | 0.62 (0.41–0.93) | 0.659 | 0.61 (0.40–0.96) | 0.58 (0.40–0.88) | 0.547 |
AFC | 27.57 (9.66) | 29.92 (8.90) | < 0.001 | 27.63 (9.62) | 27.83 (8.46) | 0.724 |
AMH (ng/mL) | 9.82 (5.63) | 10.30 (5.00) | 0.110 | 9.84 (5.64) | 9.89 (4.70) | 0.764 |
Number of oocytes retrieved | 18.85 (8.60) | 19.76 (8.51) | 0.069 | 18.87 (8.60) | 18.76 (8.08) | 0.833 |