Journal of Child Neurology published a review of the literature on handwriting performance and ADHD.  The authors suggest that children with ADHD have deficits in handwriting such as illegibility and slower speed of execution.  The authors state that larger studies using standardized testing are needed.

Reference:  Racine, Marie Brossard, Majnemer, Annette, Shevell, Michael, Snider, Laurie.  (2008)  Handwriting Performance in Children With Attention Deficit Hyperactivity Disorder (ADHD)

J Child Neurol 23: 399-406.

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