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Interaction of sleep efficiency and positive relations with others. The interaction significantly predicted plasma IL-6 levels (β = 1.19, P < 0.05). The data points shown were calculated from the same regression equation. Sociodemographic, health status, and health behavior control variables were set to their mean values. Maximal or minimal values for sleep efficiency and positive relations predictor variables were then added to the equation to generate the estimates shown here (37).
