Who is affected by attention deficit hyperactivity disorder (ADHD)
Estimates vary about how many people are affected by attention deficit hyperactivity disorder (ADHD). Part of this variation is probably due to the different sources health professionals use to diagnose it.1 The accepted standard for diagnosing ADHD is the DSM-IV criteria from the American Psychiatric Association.2 A child's dominant symptoms (inattention, impulsiveness, and/or hyperactivity) are determined and categorized. The condition affects about 3% to 5% of all school-age children in Canada.3
- Boys are diagnosed with ADHD more often than girls, with a varying ratio of 2:1 to 9:1 depending on the specific type.2
- Inattention is the most common type of ADHD diagnosed in girls. This type is the least likely of the three to be noticed in the early school years. It may not be detected until late childhood.2 Many girls may not be diagnosed and properly treated for the disorder until later in life.
- It is not clear how many adults are affected by ADHD. However, overall estimates are that about one-third of children with ADHD continue to have significant symptoms into adulthood.4 More research is needed in this area.
In addition, more research is needed to determine how many preschool children and adolescents are affected by ADHD.5
| Author: | Carrie Henley Sabra L. Katz-Wise | Last Updated: August 31, 2006 |
| Medical Review: | Adam Husney, MD - Family Medicine Michael J. Sexton, MD - Pediatrics Mina Dulcan, MD - Child and Adolescent Psychiatry Thomas Emmett Francoeur, MDCM, CSPQ, FRCPC - Pediatrics | |
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