Multiple linear regression predicting progression in cup:disc ratio during the follow up period
| Variables | Coefficient (b) | Significance (p) |
|---|---|---|
| Continuous | ||
| Number of previous vitreoretinal procedures | −0.046 | 0.033 |
| Baseline cup:disc ratio | −0.366 | 0.001 |
| Follow up period (months) | 0.001 | 0.301 |
| Categorical | ||
| Treatment modality | ||
| Medical | −0.02 | 0.617 |
| Surgical | ||
| Relevant past ophthalmic history | ||
| Myopia | <0.001 | 0.992 |
| Severe ocular injury | 0.017 | 0.828 |
| Congenital cataract | −0.017 | 0.869 |
| Diabetic retinopathy | −0.189 | 0.053 |
| No history | −0.114 | 0.125 |
| Pre-existing glaucoma | −0.117 | 0.266 |
| Other | ||
| IOP in final follow up review (mm Hg) | ||
| <6 | −0.103 | 0.542 |
| 6–21 | −0.012 | 0.901 |
| >21 | ||
| Intravitreal silicone oil endotamponade | ||
| Not used | −0.006 | 0.906 |
| Used and removed | 0.148 | 0.152 |
| Used and not removed | ||