Table 3.
The percentage outcome of blastocysts by time category in CI and ICSI. Utilization rate is the number of blastocysts transferred and frozen (by vitrification) per fertilized embryos, while the blastocyst rate is the number of embryos reaching the blastocyst stage (Gardner grade 3 and above) per fertilized embryo
| Time category | Number frozen | Number discarded | Number transferred | Total | Utilization rate | Average blastocyst rate |
|---|---|---|---|---|---|---|
| CI | ||||||
| 0 | 1034 | 1837 | 405 | 3276 | 43.93% | 46.7% |
| 1 | 3786 | 5532 | 882 | 10,200 | 45.75% | 53.2% |
| 2 | 3047 | 4530 | 805 | 8382 | 45.81% | 52.2% |
| 3 | 2868 | 4127 | 637 | 7632 | 45.91% | 53.5% |
| 4 | 2055 | 3098 | 396 | 5549 | 44.15% | 54.3% |
| 5 | 846 | 1441 | 212 | 2499 | 42.34% | 54.2% |
| 6 | 373 | 476 | 72 | 921 | 48.32% | 55.8% |
| 7 | 61 | 89 | 18 | 168 | 47.02% | 54.0% |
| Total | 14,070 | 21,130 | 3427 | 38,627 | 45.26% | 52.8% |
| ICSI | ||||||
| 0 | 28 | 45 | 15 | 88 | 48.86% | 49.2% |
| 1 | 570 | 912 | 172 | 1654 | 44.86% | 49.2% |
| 2 | 1294 | 2012 | 399 | 3705 | 45.70% | 50.9% |
| 3 | 2293 | 3424 | 612 | 6329 | 45.90% | 51.8% |
| 4 | 3021 | 4720 | 865 | 8606 | 45.11% | 49.6% |
| 5 | 2785 | 4253 | 803 | 7841 | 45.75% | 50.9% |
| 6 | 1331 | 2154 | 404 | 3889 | 44.51% | 49.6% |
| 7 | 252 | 497 | 65 | 814 | 38.94% | 46.7% |
| Total | 11,565 | 18,017 | 3,335 | 32,926 | 45.25% | 50.4% |