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. 2017 Oct 26;12(10):e0186843. doi: 10.1371/journal.pone.0186843

Fig 5. Subjective sleepiness and fatigue (low energy level) during baseline/aligned and advanced (misaligned) days.

Fig 5

Closed circles represent African-Americans and open circles represent European-Americans. Dark grey shading represents timing of scheduled sleep/dark episodes during both baseline and advanced days. Light grey shading on right panels (advanced) represents the previous baseline sleep/dark episodes. Top panel shows subjective ratings on the fatigue mood dimension (low energy level) and the bottom panel shows subjective sleepiness (Stanford Sleepiness Scale). Data are mean ± SEM. Fatigue scores were on a scale of 0–6 and the Stanford Sleepiness Scale is a scale of 1–7. For both measures higher scores represent feeling more fatigue/sleepiness. N = 23 African-Americans and 22 European-Americans. * Significant difference (P≤0.05) between African-Americans and European-Americans as determined by mixed model ANOVAs. There were significant differences between baseline/aligned and delayed/misaligned days for both variables, and there were significant differences between African-Americans and European-Americans during baseline/aligned but not during delayed/misaligned days.