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Developmental Coordination Disorder (DCD) and Attention Deficit Hyperactivity Disorder (ADHD) often co-occur and are associated with specific learning difficulties. Robust prevalence estimations do not yet exist. We studied how symptoms of DCD and/or ADHD are related to difficulties in reading, writing, and mathematics. Using the data from a large online study with a sample of 3,170 3rd and 4th grade children in Germany, including parent-reported DCD- and ADHD symptoms, we followed two approaches. In the categorical approach, we divided the children into groups with and without DCD and/or ADHD on the basis of cut-offs. The results showed that children without DCD/ADHD have fewer difficulties in all learning domains. Children with only DCD showed less learning difficulties than children with ADHD and the comorbid group. In the continuous approach, we performed a latent profile analysis on the basis of symptoms of fine and gross motor problems, inattention, hyperactivity, impulsivity, and intelligence. This yielded four disability profiles of children with (1) no DCD- or ADHD-symptoms, (2) clinical ADHD-scores and above-average DCD, (3) above-average DCD and inattention, and (4) above-average ADHD. Profiles 2 and 3 appeared related to the lowest learning achievement. Theoretical implications are discussed.

Learning Difficulties in Children with Symptoms of DCD And/or ADHD: Analyses from a Categorical and a Continuous Approach