Fig. 4.

Correlations between the grand average of MEP size ratio after QPS5 and clinical scores. Diamonds (◆) represent “PD without L-DOPA” and grey dots (●) “PD with L-DOPA”. The x-axis in each diagram indicates scores of MDS-UPDRS Part I (A), MDS-UPDRS Part II (B), and MDS-UPDRS Part III (C), “upper limb rigidity on the recorded side” scores (D), “upper limb bradykinesia on the recorded side” scores (E), and “upper limb tremor on the recorded side” scores (F). The y-axes in all diagrams indicate the grand average of MEP size ratio after QPS5. MDS-UPDRS Part I and III score had significant negative correlations with the grand average of the MEP size ratio. In the sub-scores of MDS-UPDRS Part III, “upper limb rigidity on the recorded side” and “upper limb bradykinesia on the recorded side” scores showed significant negative correlations with the grand average of the MEP size ratios (D, E). In contrast, there was no significant correlation between “upper limb tremor on the recorded side” score and MEP size ratio (F).