| Parameters | Age | Disease duration | ||
| r | p-Value | r | p-Value | |
| DML | 0.117 | 0.496 | 0.363 | 0.030 |
| DSL | 0.245 | 0.149 | 0.830 | <0.0001 |
| SCV | −0.067 | 0.698 | -0.366 | 0.028* |