| Sumario: | Compared 2 groups of children with attention deficit hyperactivity disorder, predominantly inattentive type (ADHD/IA)—those with high scores on a composite measure of sluggish cognitive tempo (SCT) and those without—using a large, school-based sample of children for which previous comparisons between ADHD subtypes have been reported. Although the 2 groups did not differ on level of attention or learning problems, high-SCT ADHD/IA children were rated by teachers as showing less externalizing behavior and higher levels of unhappiness, anxiety/depression, withdrawn behavior, and social dysfunction. Thus, SCT identifies a more homogeneous subgroup of ADHD/IA children who are, relative to the entire Diagnostic and Statistical Manual of Mental Disorders (4th ed. {DSM-IV}; American Psychiatric Association {APA}, 1994) diagnosed ADHD/IA group, more similar to those classified in previous research as “attention deficit disorder without hyperactivity.” These results support a reconsideration of SCT symptoms as a component of diagnostic criteria for a category of nonhyperactive attention deficit disorder. Reprinted by permission of the publisher.
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