SIR-It is good to see an increasing number of intervention studies for children with developmental coordination disorder (DCD) as well as for attention-deficit-hyperactivity disorder (ADHD). Watemberg et al. went to considerable effort to describe the distribution of comorbidity in children with ADHD with and without DCD and have clarified the characteristics of the children randomized to Phase 2, the intervention study, in the subsequent addendum to their report. This addendum is an extremely helpful aid for the clinical interpretation of the RESULTS:, particularly to illustrate that the 2 (14%) children in the intervention group (group A) who failed to change their Movement Assessment Battery (MABC) score did not differ from the profile of children in the untreated group (group B), either by subtype of ADHD or profile of movement difficulties. However, without information regarding additional associated comorbidities, cognitive ability, or socio-economic status of the children, it is not possible to say whether the two groups differed in a significant way on these key variables owing to chance randomization.
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