Figure 3

Gait parameters under different conditions in subjects with mild and severe Parkinson's Disease. Comparison of gait velocity, stride length and cadence between the baseline condition (BL), the conditions involving optic flow (BOF, FOF) and the condition involving the attentional strategy (AS) for the subgroup of mild PD (H&Y≤2) and severe PD (H&Y>2) subjects. The analysis has been performed for each group separately. Statistically significant differences (p < 0.05) and marginally significant differences (p < 0.10) between conditions are evidenced by, respectively, solid and dotted horizontal lines.