Pearson correlation coefficients between 6 month grating acuity scores and 36 month Kay picture test VA estimates
| No | r | p Value | PPV | NPV | |
|---|---|---|---|---|---|
| PPV, positive predictive value of VA ⩾2 c/d for predicting a VA ⩾6/9 at 36 months. NPV, negative predictive value for VA <2 c/d for predicting a VA <6/9. | |||||
| All eyes | 155 | 0.6 | <0.005 | 0.69 | 0.88 |
| Cryo Rx | 81 | 0.5 | <0.005 | 0.64 | 0.91 |
| Laser Rx | 40 | 0.6 | <0.005 | 0.67 | 0.96 |
| Subthreshold group | 34 | 0.6 | <0.005 | 0.82 | 0.58 |