Fig. 1

The distribution of the first and second principal component scores (PCSs). a Scatter diagram of the first and second PCSs in the patients and controls. Both scores were significantly higher in the controls than in the patients. b The distribution of the second PCS among the controls and the groups divided according to the SARA score of gait. The bars show the 95% confidence intervals. The number of the subjects in each group was 57 in controls, 61 in patients (2 with the SARA score of gait 0, 7 with score 1, 16 with score 2, 28 with score 3, 1 with score 4, 3 with score 5, and 4 with score 6). As there was only 1 subject in the patients with the score 4, the confidence interval in that group is not shown. *p < 0.05