Table 4.
Characteristics of treatment received by randomised group: elective single embryo transfer (eSET) or double embryo transfer (DET). Figures are numbers (percentages) unless stated otherwise
| eSET (n=683) | DET (n=684) | |
|---|---|---|
| Type of treatment: | ||
| IVF | 365 (53) | 388 (57) |
| Intracytoplasmic sperm injection | 318 (47) | 293 (43) |
| Both | 0 | 2 (0.3) |
| Missing | 0 | 1 (0.1) |
| Median (IQR) No of embryos available for transfer in first fresh cycle | 5 (3-8) | 5 (3-7) |
| Missing | 0 | 2 (0.3) |
| Embryos transferred in first fresh cycle: | ||
| 0 | 2 (0.3) | 1 (0.1) |
| 1 | 677 (99) | 7 (1) |
| 2 | 4 (1) | 676 (99) |
| Missing | 0 | 0 |
| Day of fresh embryo transfer: | ||
| Day 2 | 540 (79) | 539 (79) |
| Day 3 | 130 (19) | 131 (19) |
| Day 5 | 10 (1.5) | 9 (1.3) |
| No transfer | 2 (0.3) | 1 (0.1) |
| Missing | 1 (0.1) | 4 (0.6) |
| Median (IQR) No of blastomeres* | 4 (4-5) | 4 (4-6) |
| Missing | 30 (4) | 32 (5) |
| Grade of embryos transferred*† | ||
| Grade A | 571 (84) | 597 (87) |
| Grade B | 79 (12) | 51 (7) |
| Missing | 31 (5) | 35 (5) |
IQR=interquartile range.
*For DET, embryo with largest number of cells chosen.
†Grade A=four cells transferred on day 2 or more than six cells transferred on day 3; grade B=all others.