Figure 6.

The distribution of the gait task scores estimated by the proposed nonlinear model. HC and PD represent the healthy control subjects and the subjects with Parkinson’s disease, respectively. The theoretical score range of each gait task level is marked in the figure. The box presents the 50% of the estimated scores around the median line (namely the red horizontal segment). Its vertical width gives a direct indication of the value of the interquartile range. The whiskers indicate the maximum and minimum value of the scores. The outliers (+) are also plotted.