Fig. 1. Spectral powers in electroencephalograms (EEGs). A: Comparison of spectral powers in EEGs among groups. The spectral power was obtained by averaging the log-transformed power for every sleep stage (awake, N1, N2, N3, and REM) and nine electrodes (F3, Fz, F4, C3, Cz, C4, P3, Pz, and P4). The error bars indicate standard errors (*p<0.05, †p<0.01, and ‡p<0.001, respectively, in Mann-Whitney U-tests and Wilcoxon signed-rank tests). B: Correlation between delta-band power and IRLS scores in RLS patients (baseline condition). Delta-band power was obtained by averaging the log-transformed power for the nine electrodes and all sleep stages. Spearman's rank correlation coefficient (r) was 0.606 (p=0.037). IRLS: International Restless Legs Syndrome Severity Scale, REM: rapid eye movement, RLS: restless legs syndrome.
