Final answer:
ADHD affects approximately three to five percent of children, with males more commonly diagnosed. Symptoms include inattention and impulsivity, and a subset known as ADD applies when hyperactivity is not present. Comorbidity with other disorders such as depression or OCD is also common.
Step-by-step explanation:
Regarding the prevalence of attention deficit hyperactivity disorder (ADHD) among school-aged children, it has been indicated that approximately three to five percent of children and adults are affected by this condition. ADHD is characterized by symptoms of inattention, executive functioning difficulties, impulsivity, and hyperactivity, which go beyond what is typical for the individual's developmental stage. Males are more frequently diagnosed with ADHD than females. Additionally, a subset of ADHD, known as attention deficit disorder (ADD), is diagnosed in individuals who do not exhibit the hyperactive symptoms. It's also noted that many people with ADHD experience comorbidity, which means they can develop secondary disorders such as depression or obsessive-compulsive disorder (OCD).