Conceptual and measurement issues surrounding externalizing behavior problems and academic underachievement, the strength and specificity of the covariation between these domains, and the viability of explanatory models that link these areas are reviewed. In childhood, inattention and hyperactivity are stronger correlates of academic problems than is aggression; by adolescence, however, antisocial behavior and delinquency are clearly associated with underachievement. Whereas investigations with designs that allow accurate causal inference are scarce, unidirectional paths from 1 domain to the other have received little support. Indeed, the overlap of externalizing problems with cognitive and readiness deficits early in development suggests the influence of antecedent variables. Low socioeconomic status, family adversity, subaverage IQ, language deficits, and neurodevelopmental delay are explored as possible underlying factors.

Objectives-To determine any long-term effects, 6 and 8 years after childhood enrollment, of the randomly assigned 14-month treatments in the Multimodal Treatment Study of Children with ADHD (MTA; N=436); to test whether Attention-Deficit/Hyperactivity Disorder (ADHD) symptom trajectory through 3-years predicts outcome in subsequent years; to examine functioning level of the MTA adolescents relative to their non-ADHD peers (Local Normative Comparison Group or LNCG; N=261).Method-Mixed effects regression models with planned contrasts at 6-and 8-years tested a wide range of symptom and impairment variables assessed by parent, teacher, and youth report.Results-In nearly every analysis, the originally randomized treatment groups did not differ significantly on repeated measures or newly-analyzed variables (e.g., grades earned in school, The other authors report no conflicts of interest. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Conclusions-Type or intensity of 14 months of treatment for ADHD in childhood (at age 7.0-9.9 years old) does not predict functioning six-to-eight years later. Rather, early ADHD symptom trajectory regardless of treatment type is prognostic. This finding implies that children with behavioral and sociodemographic advantage, with the best response to any treatment, will have the best longterm prognosis. As a group, however, despite initial symptom improvement during treatment that is largely maintained post-treatment, children with Combined-Type ADHD exhibit significant impairment in adolescence. Innovative treatment approaches targeting specific areas of adolescent impairment are needed. NIH Public Access Keywords ADHD; adolescence; clinical trial; longitudinalThe Multimodal Treatment Study of Children with Attention-Deficit/Hyperactivity Disorder (ADHD), abbreviated as MTA, compared four distinct treatment strategies during childhood for 579 children diagnosed with DSM-IV ADHD, Combined type. Children were randomly assigned to 14 months of (a) systematic medication management (MedMgt), which was initial placebo-controlled titration, thrice-daily dosing, seven days per week, and monthly 30-minute clinic visits, (b) multicomponent behavior therapy (Beh), which included 27-session group parent training supplemented with eight individual parent sessions, an 8-week summer treatment program, 12 weeks of classroom administered behavior therapy with a half-time aide and 10 teacher consultation sessions, (c) their combination (Comb), or (d) usual community care (CC).1 -2 This randomized, 6-site, controlled clinical trial, conducted in parallel at 6 performance sites, feat...

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