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. 2023 Jan 19;13:1014630. doi: 10.3389/fpsyt.2022.1014630

FIGURE 2.

FIGURE 2

Scores of the pittsburgh sleep quality index (PSQI) and selected questions. Higher scores reflect worse symptom severity except in the case of sleep duration which is measured in hours. Significance: **p < 0.01. For ratio and quasi-interval scales, means and standard errors are displayed, while medians are displayed for ordinal scales.