Univariate Cox proportional hazard regression analysis for improvement of visual acuity of at least two lines
| Parameter | RR (relative risk) | 95% CI | p Value* |
|---|---|---|---|
| *All p values are two sided. | |||
| †As measured by colour fundus photos and angiography. 1 = central margin within 1 disc diameter (DD) from the fovea, 2 = between 1 and 2 DD from the fovea, and 3 = more than 2 DD away from the fovea. | |||
| Age (continuous) | 1.00 | 0.94 to 1.06 | 0.98 |
| Sex | |||
| male | 0.57 | 0.13 to 2.56 | 0.46 |
| Ref: female | |||
| Duration of symptoms (months) (continuous) | 0.93 | 0.85 to 1.01 | 0.09 |
| Pretreatment | |||
| Yes | 0.03 | 0.0 to 28.68 | 0.31 |
| Ref: no | |||
| Location† | |||
| group 1 | 0.52 | 0.10 to 2.68 | 0.43 |
| Ref: group 2 and 3 | |||
| No of PDT sessions (continuous) | 0.2 | 0.05 to 0.87 | 0.03 |
| Visual acuity before PDT (continuous) | 1.01 | 0.98 to 1.04 | 0.35 |
| Tumour height before PDT (mm) (continuous) | 0.96 | 0.43 to 2.17 | 0.92 |
| Tumour shrinkage (mm) (continuous) | 2.52 | 0.96 to 6.61 | 0.06 |