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Table 3 Stratification of study participants

From: The PD-Ballet study: study protocol for a randomised controlled single-blind hybrid type 2 clinical trial evaluating the effects of ballet dancing on motor and non-motor symptoms in Parkinson’s disease

Group 1: mild

Hoehn and Yahr stages I and II

Group 2: moderate

Hoehn and Yahr stage III

Group 3: severe

Hoehn and Yahr stages IV and V