Fig. 3
From: Sleep alterations as a function of 88 health indicators
Selected health indicators with weak associations with EEG PSD. The charts show Pearson correlations (for binary variables, corresponding to point-biserial correlations) between relative log10 PSD and the self-reported presence of any sleep disorder, sleep apnea, cigarettes smoked, and cups of coffee consumed within 4 h of sleep. Correlations that are significant after correction for FDR are marked with a circle with a color marking the appropriate channel and vigilance state