CS | VA | LR test between models† | |||
R2‡ | P value§ | R2‡ | P value§ | P value | |
Both eyes | |||||
On-road driving score (0–3) | 0.0001 | 0.895 | 0.00 | 0.946 | 0.9935 |
Worst eye | |||||
On-road driving score (0–3) | 0.0062 | 0.332 | 0.0037 | 0.454 | 0.824 |
Difference between the eyes | |||||
On-road driving score (0–3) | 0.059 | 0.411 | 0.057 | 0.568 | 0.999 |
*Excellent=0, Good=1, Moderate=2, Poor=3.
↵†P values under 0.05 mean that CS improved the prediction of on-road driving scores compared with VA alone.
‡Crude R2 were used instead of adjusted R2 given values were close to 0 and adjustment methods become inadequate. R2 corresponds to the test’s contribution in explaining on-road driving scores and ranges from 0 to 1.
§Significance of contribution of visual component.
CS, contrast sensitivity; LR, likelihood ratio; VA, visual acuity.