Verdandi wrote:
The 30% study is far too low for what has been observed in most other studies.
Community and general population studies show statistics that are anywhere from 13% to 50% depending on the sample studied and anywhere from 20% to 85% in clinical samples, per recent research linked below.
30% is close to the average for the general population studies that have been done and 50% is close to the average of the clinical samples that have been studied.
Unfortunately, per the DSMIV guidelines, actual dual diagnoses are prohibited for Autism Spectrum Disorders and ADHD. Some diagnosing professionals bypass the guidelines and provide dual diagnoses. The fact that most follow the guidelines, makes it difficult to gain hard statistics on the percentage of individuals that actually meet the DSMIV criteria for both disorders. When only one diagnosis is given ASD trumps ADHD per DSMIV guidelines.
Per the research I referenced there is also a significant number of those with ADHD that exhibit symptoms of ASD's although not serious enough to be meet criteria for an ASD diagnosis.
My understanding is that there is serious debate on this issue in the DSMV organization and the current revisions in the DSMV could be changed to allow a dual diagnosis of Autism Spectrum Disorder and ADHD in the final DSMV revision, which is a good idea for individuals to be properly treated for symptoms of ADHD whom are currently diagnosed with an ASD.
http://www.ncbi.nlm.nih.gov/pmc/article ... ool=pubmedQuote:
Clinical anecdotes, case reports, and empirical studies demonstrate that many children display both ADHD and ASD symptoms (Hattori et al., 2006; Holtmann, Bolte, & Poustka, 2007; Mulligan et al., 2009; Nijmeijer et al., 2008; Reiersen & Todd, 2008; Nijmeijer et al., 2009; Rommelse et al., 2009; Rommelse, Franke, Geurts, Hartman, & Buitelaar, 2010). Yet, the Diagnostic and Statistical Manual of Mental Disorders, fourth edition (American Psychiatric Association, 1994), does not allow for the comorbid diagnoses of Attention-Deficit/Hyperactivity Disorder (ADHD) and Pervasive Developmental Disorders (referred to from here on as autism spectrum disorders, ASD). The prevalence of ADHD symptoms in individuals with a primary clinical diagnosis of ASD ranges between 13% and 50% in population and community based studies (Bradley & Isaacs, 2006; Icasiano, Hewson, Machet, Cooper, & Marshall, 2004; Keen & Ward, 2004; Montes & Halterman, 2006; Ronald, Simonoff, Kuntsi, Asherson, & Plomin, 2008; Simonoff et al., 2008) and between 20% and 85% in clinical samples (de Bruin, Ferdinand, Meester, de Nijs, & Verheij, 2007; Gadow, DeVincent, & Pomeroy, 2006; Gillberg, 1989; Goldstein & Schwebach, 2004; Holtmann, Bolte, & Poustka, 2005; Holtmann et al., 2007; Ogino et al., 2005; Lee & Ousley, 2006; Sinzig, Morsch, Bruning, Schmidt, & Lehmkuhl, 2008; Sturm, Fernell, & Gillberg, 2004; Wozniak et al., 1997)