| Table 1. Randomization allocation and exclusions | ||
|
Group 1 Semi-rigid catheter |
Group 2 Flexible catheter |
|
| Randomized follicular aspirations | 370 | 369 |
| Aspirations excluded | ||
| No mature oocytes retrieved | 3 | 10 |
| Complete fertilization failure | 1 | 4 |
| Complete cleavage failure | 1 | 3 |
| No fresh sperm available | 0 | 1 |
| Endometrium unfit for ET | 0 | 4 |
| Impossible mock ET | 1 | 2 |
| OHSS risk | 1 | 5 |
| Included follicular aspirations | 363 | 340 |