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Marginally significant curvilinear relations between time in bed and externalizing problems controlling for grade, gender, and sleep quality. Solid line and circular markers represent the model-estimated values at the mean level of time in bed, 9.78 hours (center marker) ± 3 hours (outer markers). Dotted line represents the sample mean of the y-axis variable. Panel A (reactive aggression), quadratic trend p = .073; Panel B (proactive aggression), quadratic trend p = .088.
