| Tube size (F) | n (%) | Death + surgery combined (%) | Death (%) | Surgery (%) |
| <10 | 58 (14) | 21 (36) | 10 (17) | 11 (19) |
| 10–14 | 208 (51) | 75 (36) | 46 (22) | 35 (17) |
| 15–20 | 70 (17) | 28 (40) | 18 (25) | 13 (19) |
| >20 | 69 (17) | 30 (43) | 17 (25) | 13 (19) |
| χ2 3df = 1.41, p = 0.70 | χ2 3df = 1.53, p = 0.67 | χ2 3df = 0.27, p = 0.97 |