Fig. 1. Correlation analysis between RLS severity and PD nonmotor symptom severity. RLS severity was positively correlated with ISI (A) and negatively correlated with PDSS score (B). The SCOPA-AUT total score (C) and urinary subscore (D) were positively correlated with RLS severity. IRLS: international restless legs syndrome, ISI: Insomnia Severity Index, PDSS: Parkinson's Disease Sleep Scale, RLS: restless legs syndrome, SCOPA-AUT: Scales for Outcomes in Parkinson's Disease for Autonomic Symptoms.