Dr. Russell Barkley has listed a number of statistics concerning ADHD:

• A classroom with 30 students will have between 1 and 3 children with ADHD.
• Boys are diagnosed with ADHD 3 times more often than girls.
• Emotional development in children with ADHD is 30% slower than in their non-ADD peers. This means that a child that is 10 years old will have the emotional development of a 7 year old, a 20 year old will have the emotional maturity of a 14 year old.
• One fourth of children with ADHD have serious learning disabilities such as: oral expression, listening skills, reading comprehension and/or math.
• 65% of children with ADHD exhibit problems in defiance or problems with authority figures. This can include verbal hostility and temper tantrums.
• 75% of boys diagnosed with ADD/ADHD have hyperactivity.
• 60% of girls diagnosed with ADD/ADHD have hyperactivity.
• 50% of children with ADHD experience sleep problems.
• Teenagers with ADHD have almost four times as many traffic citations as non-ADD/ADHD drivers. They have four times as many car accidents and are seven times more likely to have a second accident.
• 21% of teens with ADHD skip school on a regular basis, and 35% drop out of school before finishing high school.
• 45% of children with ADHD have been suspended from school at least once.
• 30% of children with ADHD have either repeated a year in school.

Source:

Taking Charge of ADHD, Dr. Russell Barkley

http://www.russellbarkley.org