Final answer:
Approximately three to five percent of children and adults are affected by ADHD. Some patients with ADHD do not have the hyperactive component of symptoms and are diagnosed with attention deficit disorder (ADD). Many people with ADHD also have comorbidities such as depression or OCD.
Step-by-step explanation:
Approximately three to five percent of children and adults are affected by attention deficit/hyperactivity disorder (ADHD). Some patients do not have the hyperactive component of symptoms and are diagnosed with a subtype of ADHD: attention deficit disorder (ADD). Many people with ADHD also show comorbitity, developing secondary disorders such as depression or obsessive compulsive disorder (OCD). While ADHD is often considered a childhood disorder, it can impact individuals at any age.