Table 2.
Baseline demographics and characteristics of day 3 single embryo transfer cycles across three centers (dataset 2, n = 1691)
| Features | Mean ± SD/n (%) | ||
|---|---|---|---|
| Center 1 | Center 2 | Center 3 | |
| Number of cycles | 1269 | 150 | 272 |
| Female age | 31.5 ± 3.6 | 32.1 ± 3.7 | 31.4 ± 3.5 |
| BMI | 21.6 ± 2.9 | 21.7 ± 2.9 | 21.4 ± 2.9 |
| Stimulation protocol | |||
| Agonist | 806 (63.5%) | 98 (65.3%) | 120 (44.1%) |
| Antagonist | 448 (35.3%) | 48 (32.0%) | 135 (49.6%) |
| Nonconventional | 15 (1.2%) | 4 (2.7%) | 17 (6.3%) |
| Endometrial thickness (mm) | 10.9 ± 2.4 | 11.7 ± 2.7 | 10.8 ± 2.1 |
| Day 2 cell number | |||
| 1–3 | 54 (4.3%) | 6 (4.0%) | 9 (3.3%) |
| 4 | 1139 (89.8%) | 135 (90.0%) | 252 (92.7%) |
| 5–8 | 76 (6.0%) | 9 (6.0%) | 11 (4.0%) |
| Day 2 fragmentation rate (0–5%) | 1115 (87.9%) | 83 (55.3%) | 229 (84.2%) |
| Day 3 cell number | |||
| 4–5 | 5 (0.4%) | 1 (0.7%) | 3 (1.1%) |
| 6–7 | 103 (8.1%) | 15 (10.0%) | 5 (1.8%) |
| 8 | 1120 (88.3%) | 123 (82%) | 258 (94.9%) |
| 9–16 | 41 (3.2%) | 11 (7.3%) | 6 (2.2%) |
| Day 3 fragmentation rate (< 10%) | 1090 (85.9%) | 69 (46.0%) | 220 (80.9%) |
| Pregnancy rate | 681 (53.7%) | 67 (44.7%) | 120 (44.1%) |
SD standard deviation, BMI body mass index