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BACKGROUND: Comorbidity among developmental disorders such as dyslexia, language impairment, attention deficit/hyperactivity disorder and developmental coordination disorder is common. This study explores comorbid weaknesses in preschool children at family risk of dyslexia with and without language impairment and considers the role that comorbidity plays in determining children's outcomes. METHOD: The preschool attention, executive function and motor skills of 112 children at family risk for dyslexia, 29 of whom also met criteria for language impairment, were assessed at ages 3½ and 4½ years. The performance of these children was compared to the performance of children with language impairment and typically developing controls. RESULTS: Weaknesses in attention, executive function and motor skills were associated with language impairment rather than family risk status. Individual differences in language and executive function are strongly related during the preschool period, and preschool motor skills predicted unique variance (4%) in early reading skills over and above children's language ability. CONCLUSION: Comorbidity between developmental disorders can be observed in the preschool years: children with language impairment have significant and persistent weaknesses in motor skills and executive function compared to those without language impairment. Children's early language and motor skills are predictors of children's later reading skills.

Original publication

DOI

10.1111/jcpp.12139

Type

Journal article

Journal

J Child Psychol Psychiatry

Publication Date

03/2014

Volume

55

Pages

237 - 246

Keywords

Comorbidity, dyslexia, executive function, language disorder, motor skills, Attention, Child, Preschool, Comorbidity, Dyslexia, Executive Function, Female, Genetic Predisposition to Disease, Humans, Individuality, Language Development Disorders, Male, Motor Skills, Predictive Value of Tests, Prospective Studies, Reading, Risk