Figure 3

Minimum, first quartile (q1), median, third quartile (q3) and maximum values of mean absolute errors ( mae ) relative to: (a) IC and (b) stride time for all groups (healthy elderly – E, hemiparetic – H, Parkinson’s disease – P and choreic – C) and for both comfortable (V1) and higher (V2) speed. Errors larger than q₁ + 1.5(q₃ + q₁) or smaller than q₁–1.5(q₃–q₁) are considered outliers and represented with red marks (+).