Table 1.
Participant characteristics
| Mean | S.D. | t-Value | p-Value | Eta squared | |
|---|---|---|---|---|---|
| Age | |||||
| Safe | 62.9 | 8.9 | –1.0 | 0.33 | 0.04 |
| Marginal | 66.1 | 6.5 | |||
| Education | |||||
| Safe | 16.2 | 2.5 | 1.4 | 0.18 | 0.08 |
| Marginal | 14.6 | 3.5 | |||
| Disease duration | |||||
| Safe | 4.1 | 2.0 | –1.0 | 0.33 | 0.04 |
| Marginal | 5.6 | 5.5 | |||
| UPDRS (motor only) | |||||
| Safe | 15.0 | 8.7 | –2.6 | 0.02 | 0.2 |
| Marginal | 25.5 | 11.5 | |||
| 3MS | |||||
| Safe | 97.4 | 1.9 | 2.6 | 0.02 | 0.2 |
| Marginal | 92.6 | 5.7 | |||
| Levodopa equivalent dose | |||||
| Safe | 535.7 | 161.0 | 0.7 | 0.5 | 0.02 |
| Marginal | 477.3 | 270.5 | |||
| GDS | |||||
| Safe | 2.2 | 2.1 | 0.04 | 0.9 | <0.01 |
| Marginal | 2.2 | 2.5 | |||
| Weekly distance driven | |||||
| Safe | 202.3 | 143.7 | 1.2 | 0.3 | 0.06 |
| Marginal | 141.8 | 102.3 | |||
| Years driving | |||||
| Safe | 47.6 | 7.5 | 0.3 | 0.8 | 0.004 |
| Marginal | 46.5 | 10.0 |