Relative risk of graft failure at 5 years
| Factor | n | Relative risk | 95% CI | p Value |
| Indication for graft (p=0.01) | ||||
| Viral infection | 82 | 1.0 | – | |
| Other infections | 195 | 2.2 | 1.3 to 3.6 | 0.003 |
| Ulcerative keratitis | 195 | 1.8 | 1.1 to 3.1 | 0.03 |
| Ectasias/dystrophies | 57 | 0.93 | 0.4 to 2.2 | 0.9 |
| Other indications | 114 | 1.4 | 0.8 to 2.6 | 0.2 |
| Preoperative acuity (p=0.0002) | ||||
| Better than light perception | 466 | 1.0 | – | |
| Light perception, NP | 144 | 1.8 | 1.3 to 2.4 | 0.0005 |
| Not reported | 33 | 2.1 | 1.3 to 3.7 | 0.006 |
| Graft size (p=0.02) | ||||
| <9.00 mm | 477 | 1.0 | – | |
| ≥9.00 mm | 147 | 1.6 | 1.1 to 2.1 | 0.006 |
| Not reported | 19 | 1.2 | 0.6 to 2.4 | 0.6 |
| Preoperative conditions (p=0.02) | ||||
| No | 312 | 1.0 | – | |
| Yes | 178 | 1.5 | 1.1 to 2.1 | 0.02 |
| Unknown | 153 | 1.5 | 1.1 to 2.1 | 0.02 |
| Gender match (p=0.05) | ||||
| Female donor/female recipient | 137 | 1.0 | – | |
| Female donor/male recipient | 134 | 1.1 | 0.7 to 1.8 | 0.6 |
| Male donor/female recipient | 192 | 1.5 | 0.99 to 2.3 | 0.05 |
| Male donor/male recipient | 180 | 1.7 | 1.1 to 2.5 | 0.02 |
| Grafted for visual reasons (p=0.09) | ||||
| Yes | 328 | 1.0 | – | |
| No | 246 | 1.3 | 0.99 to 1.8 | 0.06 |
| Unknown | 69 | 1.5 | 0.95 to 2.4 | 0.08 |