Risk factors for peripheral iridotomy failure
| Univariate | Multivariate | |||
| Risk factor | HR | P value | HR | P value |
| Age at PI | 0.931 | <0.001 | 0.933 | <0.001 |
| Female | 0.368 | 0.082 | ||
| Caucasian | 0.527 | 0.330 | ||
| Surgical PI | 0.198 | <0.001 | 0.151 | <0.001 |
| Bombe | 3.582 | 0.001 | 2.180 | 0.046 |
| First PI (compared with subsequent) | 0.918 | 0.814 | ||
| Inflammation at PI | 1.567 | 0.159 | ||
| Oral steroid | 2.421 | 0.036 | 1.745 | 0.246 |
| Inflammation 1 m | 2.252 | 0.033 | 1.418 | 0.331 |
HR is conditional hazard ratio (conditional on random effects).
PI, peripheral iridotomy.