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. 2014 Dec 23;8:1019. doi: 10.3389/fnhum.2014.01019

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Copyright © 2014 Arns, Feddema and Kenemans.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Correlations between the PSQI score and inattention (left) and hyperactivity/impulsivity (right). Note the strong correlation for inattention, where the association between sleep problems (PSQI score) and ADHD symptoms was found for the whole group and also within the ADHD group, suggesting these almost seem to form a continuum from healthy controls (gray) to adults with ADHD (black), and for the whole group this association explained 59% of the variance for inattention. For Hyperactivity/Impulsivity the correlation was only significant for the whole group and not for the subgroups, suggesting this is only driven by group differences.