Table 1: Staging of parkinsons disease.

Modified Hoehn And Yahr Staging
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