Hoehn and Yahr scale
Encyclopedia
The Hoehn and Yahr scale is a commonly used system for describing how the symptoms of Parkinson's disease
Parkinson's disease
Parkinson's disease is a degenerative disorder of the central nervous system...

progress. It was originally published in 1967 in the journal Neurology by Melvin Yahr and Margaret Hoehn. The original scale included stages 1 through 5. Since then, stage 0 has been added, and stages 1.5 and 2.5 have been proposed. This modified scale allocates stages from 0 to 5 to indicate the relative level of disability.
  • Stage 0: No signs of disease.
  • Stage 1: Unilateral symptoms only.
  • Stage 1.5: Unilateral and axial involvement.
  • Stage 2: Bilateral symptoms. No impairment of balance.
  • Stage 2.5: Mild bilateral disease with recovery on pull test.
  • Stage 3: Balance impairment. Mild to moderate disease. Physically independent.
  • Stage 4: Severe disability, but still able to walk or stand unassisted.
  • Stage 5: Needing a wheelchair or bedridden unless assisted.
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