About 3 to 5 percent of school-age children in the United States are thought to have AdHD. This means for a classroom of 20 to 30 students, on average there is one child with ADHD. Boys are four time more likely than girls to be diagnosed with ADHD.
About 5% of the adult population has ADHD.
according to a recent program i watched
1 in 25 people have ADD/ADHD
3 to 5 percent
ADHD is diagnosed in boys three of four times more often
About 20 million people.
Over 3 million people in the US stutter.
This disorder was unnamed and not diagnosed until recently, but I can not see any indication that any of the US Presidents suffered from it.
6%
The prevalence of obesity in the United States has been steadily increasing over the past decade.
onset /prevalence/
Another word for prevalence is widespread.
About 1 in 10 people are currently allergic to seafood in the United States.
In the US, there are currently almost 500,000 people with Down Syndrome.
According to the CDC, as of 2007 North Carolina has the highest rate of diagnosed ADHD in children(4-17) at 15.6%.
The HIV prevalence in adults is about 14.3%