Table 1.
Demographics and baseline characteristics. Day of embryo transfer and embryo morphology are shown as n (% of total); all others are shown as mean (SD)
| < 35 (n = 3789) | 35–37 (n = 2200) | 38–40 (n = 1624) | 41–41 (n = 319) | > 42 (n = 243) | p value | |
|---|---|---|---|---|---|---|
| Patient age (years) | 31.56 (2.69) | 36.47 (0.87) | 39.41 (0.87) | 41.44 (0.29) | 43.02 (0.90) | < 0.0001 |
| BMI (kg/m2) | 24.86 (5.12) | 25.99 (5.42) | 26.41 (5.90) | 26.81 (5.69) | 25.88 (5.34) | < 0.0001 |
| Paternal age (years) | 34.01 (4.58) | 38.46 (4.35) | 41.13 (5.04) | 42.71 (5.93) | 43.83 (5.10) | < 0.0001 |
| Antral follicle count | 19.78 (10.33) | 16.32 (8.86) | 13.90 (7.31) | 12.47 (5.99) | 12.77 (6.51) | < 0.0001 |
| Anti-Müllerian hormone (ng/mL) | 3.80 (4.01) | 2.93 (4.65) | 2.20 (2.27) | 1.73 (1.94) | 1.73 (2.24) | < 0.0001 |
| Day 3 follicle-stimulating hormone (IU/L) | 6.90 (2.74) | 7.43 (2.96) | 7.68 (2.97) | 8.34 (3.81) | 7.75 (3.66) | < 0.0001 |
| Day of embryo transfer | ||||||
| 5 | 1212 (31.99%) | 618 (28.09%) | 386 (23.77%) | 69 (21.63%) | 44 (18.11%) | < 0.0001 |
| 6 | 2564 (67.67%) | 1568 (71.27%) | 1226 (75.49%) | 247 (77.43%) | 198 (81.48%) | |
| 7 | 13 (0.34%) | 14 (0.64%) | 12 (0.74%) | 3 (0.94%) | 1 (0.41%) | |
| Embryo morphology | ||||||
| Excellent | 1057 (27.90%) | 513 (23.32%) | 302 (18.60%) | 48 (15.05%) | 38 (15.64%) | < 0.0001 |
| Good | 2061 (54.39%) | 1200 (54.55%) | 919 (56.59%) | 183 (57.37%) | 126 (51.85%) | |
| Poor | 671 (17.71%) | 487 (22.14%) | 403 (24.82%) | 88 (27.59%) | 79 (32.51%) | |