Most information available about the prevalence of the disorder of written expression is based on studies of reading disorders or learning disorders in general. (emedicine.medscape.com)
A child with ADHD and CD does have a greater chance of experiencing learning disabilities such as reading disorders and verbal impairment. (healthychildren.org)
Yet, dyslexics or children with reading disorders make up 70 - 80 % of the special education students. (wrightslaw.com)