Figure 1.

Relationship between sleep duration (left panels) and chronic fatigue (right panels) grouped into quartiles, for carbohydrate (upper) and fat (lower) as a percentage of total energy intake. Figures represent estimated marginal means from regression models and standard error bars. Dotted lines through the means of the first and last quartiles are presented as a visual aid—as sleep duration and chronic fatigue score increase, the percent of energy from carbohydrates decreases and the percent of energy from fat increases.