Should sluggish cognitive tempo symptoms be included in the diagnosis of attention-deficit/hyperactivity disorder?
OBJECTIVE: To determine the impact of including sluggish cognitive tempo items on the factor and latent class structure of attention-deficit/hyperactivity disorder (ADHD) subtypes in boys and girls. METHOD: Parent report of two sluggish cognitive tempo items on a population-based sample of 1430 female twins and 1414 male twins were analyzed along with parent report of the 18 DSM-IV ADHD items using principal components analysis and latent class analysis. RESULTS: The inclusion of the two sluggish cognitive tempo items resulted in distinct factor structures for boys and girls. For boys there were separate inattentive, hyperactive/impulsive, and sluggish factors. For girls there were separate inattentive/sluggish, hyperactive, and impulsive factors. In contrast, sluggish cognitive tempo items had minimal impact on the latent class structure of ADHD for both boys and girls. CONCLUSIONS: The inclusion of sluggish cognitive tempo items markedly changed ADHD symptom associations for boys and
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