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Visuospatial WM as assessed with Block Sequence in the ADHD, ADHD+RD, RD and normal control groups as indicated by the presence or absence of ADHD and RD. Means were adjusted for age and expressed in z-scores (higher scores indicating better performance). Note: post-hoc testing indicated that the ADHD only group (ADHD present, RD absent) had a significant poorer performance on visuospatial WM than the ADHD+RD group (both ADHD and RD present)
