Epidemiological studies of children and adolescents with intellectual disability have found 30-50% exhibiting clinically significant behavior problems. Few studies, however, have assessed young children, included a cognitively typical comparison group, assessed for specific disorders, and/or studied family correlates of diagnosis. We assessed 236 5-year old children, 95 with developmental delay (DD) and 141 with typical development (TD), for clinical diagnoses using a structured interview. Every disorder assessed was more prevalent in the developmental delay group. The percent of children meeting criteria for Attention Deficit Hyperactivity Disorder (ADHD) most highly differentiated the two groups (ratio 3.21 to 1). There was high stability from externalizing behavior problems at age 3 to ADHD diagnoses at age 5 in both groups. In regression analyses, parenting stress at child age 3 related to later ADHD diagnosis in both groups and maternal scaffolding (sensitive teaching) also predicted ADHD in the DD group.Children and adolescents with developmental delays are at high risk for emotional and behavioral problems. Epidemiological studies of youth with intellectual disability (ID) have reported clinically significant emotional and behavior problems and/or diagnosable mental disorder in a third to a half of cases (Cormack, Brown, & Hastings, 2000;Dekker & Koot, 2003;Einfeld & Tonge, 1996;Emerson, 2003a;Koskentausta, Iivanainen, & Almqvist, 2007). In the present study we assessed behavior disorders longitudinally from age 3 to 5 in children with developmental delay (DD) or typical development (TD), focusing on ADHD. We use the term "developmental delay" rather than the more formal diagnosis of intellectual disability for this sample of young children, as classification would be less stable over time than with school-aged and older children and it was based upon IQ alone. We had three primary aims: (1) to determine the relative risk of diagnosable mental disorders in children with or without DD; (2) to determine whether early externalizing behavior problems are stable and predict subsequent ADHD diagnosis; and (3) to explore whether family characteristics relate longitudinally to ADHD diagnosis.Correspondence should be addressed to: Dr. Bruce L. Baker, Department of Psychology, UCLA, 405 Hilgard Ave, Los Angeles, CA. 90095. baker@psych.ucla.edu.
NIH Public AccessAuthor Manuscript J Clin Child Adolesc Psychol. Author manuscript; available in PMC 2011 January 1.
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NIH-PA Author ManuscriptMost studies of co-occurring psychiatric diagnosis among youth with ID have sampled children with a wide age range, often from age five or six years through mid or late adolescence. From these age-mixed samples, often assessed at a single time point, one can draw only limited conclusions about age of onset and trajectory of emotional and behavior problems. In one notable exception, the authors conducted three assessments over a five year period and used multi-level growth curve a...