The study, which appears in Pediatrics, adds written-language disorder to this list, says study author Slavica K. Katusic, MD, an associate professor of epidemiology and pediatrics at the Mayo Clinic in Rochester, Minn.
Written-language disorder is an umbrella term that refers to difficulty with written language expression, including punctuation, spelling, grammar, and handwriting. “Teachers, psychologists, and parents are more intrigued by reading problems and ADHD, and no one is paying attention to writing problems,” she says.
Researchers analyzed medical, school, and private tutoring records for 5,718 children who were born from 1976 to 1982 and remained in Rochester, Minn., at least until their fifth birthday. Of these, 379 were diagnosed with ADHD. They found that 64.5% of boys with ADHD showed signs of written-language disorder by the time they were 19, compared with 16.5% of boys without ADHD. Among girls, 57% of those with ADHD had issues expressing themselves in writing by age 19. By contrast, just 9.4% of girls without ADHD experienced difficulty with punctuation, grammar, spelling, and written language expression, the study shows.
Dyslexia More Common Among Girls With ADHD, Writing Issues
Written-language disorder often comes with reading disability. Girls with ADHD and written-language disorder were much more likely to also have a reading disability than boys with ADHD, the study shows.
The ability to express oneself clearly in writing is an important skill, Katusic says. Handwriting has become somewhat obsolete as more people rely on computers to type, but “you can still make grammatical errors and poor paragraph organization on a computer,” she says. Issues associated with written-language disorder can occur alone or in tandem, but poor penmanship on its own does not constitute written-language disorder.