(Attention deficit hyperactivity disorder) is the most commonly studied and diagnosed psychiatric disorder in children, affecting about 3 to 5 percent of children globally – 30 to 50 percent of those individuals diagnosed in childhood continuing to have symptoms into adulthood. ADHD is diagnosed two to four times more frequently in boys than in girls. Adolescents and adults with ADHD tend to develop coping mechanisms to compensate for some or all of their impairments.
Signs and symptoms
ADHD has three subtypes:

Predominantly hyperactive-impulsive

Have difficulty maintaining focus on one task
Become bored with a task …