ADHD Combined Type and ADHD Predominantly Inattentive Type Are Distinct and Unrelated Disorders

By R. Milich, Amy C. Balentine, Donald R. Lynam. 2006

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Parent and Teacher Ratings on the IOWA Conners Rating Scale (2008, background): “Third, there is growing consensus that hyperactive/impulsive (HY) and inattentive (IN) behaviors are conceptually and empirically distinct (e.g., Barkley 1997; Lahey et al. 1988; Milich et al. 2001; Pillow et al. 1998), but the IO scale of the IOWA Connners conflates these two dimensions of behavi”
Academic and educational outcomes of children with ADHD. (2007, background): “of ADHD-C.(12,13) Some studies have not found different outcomes in terms of academic attainment, use of special services, and rates of high school graduation.”
Pragmatic aspects of communication and language comprehension in groups of children differentiated by teacher ratings of inattention and hyperactivity. (2007, background): “diagnosed populations (see Milich, Balentine & Lynham, 2001 ) we found no evidence for Inattention, hyperactivity and pragmatic language skills”
Performance and Private Speech of Children with Attention-Deficit/Hyperactivity Disorder While Taking the Tower of Hanoi Test: Effects of Depth of Search, Diagnostic Subtype, and Methylphenidate (2005, result): “subtype. Although these results are consistent with the view that the two subtypes may represent qualitatively different disorders (Barkley, 1997; Milich, Balentine, & Lynam, 2001 ), some have objected that the evidence does not allow for such a sharp differentiation (Hinshaw, 2001).”