Fig. 1.

Actigraphic measures of circadian rhythm robustness (a) and timing (b) in healthy controls, ADHD + medication and ADHD with no medication groups, displayed as boxplots and jittered data points. a There was no significant difference between groups for interdaily stability (IS), but intradaily variability (IV) was significantly higher in controls than in the ADHD no medication group. Relative amplitude was significantly lower in the ADHD + medication group than the control group. b There were no significant differences in the timing of the activity rhythm, as assessed by the time-of-onset of the least active 5 h period (L5 onset), the time of mid-sleep on free days or social jetlag. *P < 0.05, ***P < 0.001