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Mean and CI (95%) for each gait parameter separated for each Hoehn and Yahr stage. Statistically significant post hoc comparisons are highlighted (* p ≤ 0.05, ** p ≤ 0.01, *** p ≤ 0.001). (a) Step length per Hoehn and Yahr stage for the 20 m straight walk, (b) Step length per Hoehn and Yahr stage for the circular walk, (c) Step time per Hoehn and Yahr stage for the 20 m straight walk, (d) Step time per Hoehn and Yahr stage for the circular walk
