Figure 2.

Association between EEG sleep parameters and subjective quality of sleep: (A) data controlled for sex and age; (B) data controlled for age and shown separately for men (gray bars) and women (red bars); (C) data controlled for sex and age and shown separately for three age groups: Young, 20–30 years (yellow bars); Middle-aged, 31–64 years (light green bars); and Older, 65–84 years (dark green bars). For reference, the horizontal lines indicate the corresponding Cohen's d effect size: S, small, d = 0.2; M, medium, d = 0.5; H, high, d = 0.8. ^* indicate significant effects following FDR (False-Discovery Rate) correction (p < 0.05). § indicates a significant difference (p < 0.05) between men and women Kendall's Tau-values. • indicates a significant difference (p < 0.05) between younger and older Kendall's Tau-values. LPS, latency to persistent sleep (min); TST, total sleep time (min); SE, sleep efficiency (%); NAW, number of awakenings; REM, rapid eye movement; Stage 1, duration of stage 1 sleep (min); Stage 2, duration of stage 2 sleep (min); Stage 4, duration of stage 4 sleep (min); SWS, slow wave sleep; SWA, slow wave activity (μV²); SWA%, slow wave activity in percentage of total power; SFA, sigma activity (μV²); SFA%, sigma activity in percentage of total power.