| Modified Hoehn And Yahr Staging | |
|---|---|
| STAGE | DESCRIPTION |
| 0 | No sign of disease |
| 1 | Unilateral disease |
| 1.5 | Unilateral plus axial involvement |
| 2 | Bilateral disease without involvement of balance |
| 2.5 | Mild bilateral disease, with recovery on pull test |
| 3 | Mild to moderate bilateral disease, some postural instability, physically independent |
| 4 | Severe disability, still able to walk or stand unassisted |
| 5 | Wheel chair bound or bed ridden unless aided |