Hoehn & Yahr
Parkinson's disease staging
Grade 0
No visible symptoms of Parkinson's diseaseGrade 1
Symptoms on only one side of the bodyGrade 2
Symptoms on both sides of the body and no difficulty walkingGrade 3
Symptoms on both sides of the body and minimal difficulty walkingGrade 4
Symptoms on both sides of the body and moderate difficulty walkingGrade 5
Symptoms on both sides of the body and unable to walkReference
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