Table 1.
Characteristics of the study population and embryos
| Characteristic | Description |
|---|---|
| Number of couples, n | 652 |
| Number of cycles, n | 921 |
| Mean female age, (years, ± SD) | 31.8 ± 4.0 |
| Mean male age, (years, ± SD) | 33.2 ± 4.7 |
| Number of retrieved oocytes, n | 13979 |
| Mature oocytes, n (%) | 10969 (78.5%) |
| Number of cleavage embryos, n (%) | 8102 (73.9%) |
| Blastocysts obtained, n (%) | 3238 (40.0%) |
| Day of biopsy, n (%) | |
| Day 5 | 710 (21.9%) |
| Day 6 | 2462 (76.0%) |
| Day 7 | 66 (2.1%) |
| Blastocyst expansion, n (%) | |
| 4 | 83 (2.6%) |
| 5 | 2523 (77.9%) |
| 6 | 632 (19.5%) |
| ICM grade, n (%) | |
| A | 446 (13.8%) |
| B | 2604 (80.4%) |
| C | 188 (5.8%) |
| TE grade, n (%) | |
| A | 424 (13.1%) |
| B | 1960 (60.5%) |
| C | 854 (26.4%) |
| Blastocysts successfully analyzed (n, %) | 3149 (97.3%) |
Continuous variables are expressed as median ± standard deviation (SD) and categorical values are presented as number (percentages). ICM, inner cell mass, TE, trophectoderm