Hoehn and Yahr scale is a commonly used system for describing how the symptoms of Parkinson's disease progress
Stage one: Symptoms on one side of the body only.
Stage two: Symptoms on both sides of the body. No impairment of balance.
Stage three: Balance impairment. Mild to moderate disease. Physically independent.
Stage four: Severe disability, but still able to walk or stand unassisted.
Stage five: Wheelchair-bound or bedridden unless assisted
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