ADHD is one of the most common childhood disorders and can continue
through adolescence and into adulthood. The average age of onset is 7
years old.
ADHD affects about 4.1% American adults age 18 years and older
in a given year. The disorder affects 9.0% of American children age 13
to 18 years. Boys are four times at risk than girls.
Studies show that the number of children being diagnosed with ADHD is increasing, but it is unclear why.
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