The rest fell somewhere in the middle, according to the 2008 survey of 403,981 adults.
In a survey of 1,000 adults, the test found that 1.5 percent were pathological gamblers and another 3 percent had serious problems with gambling.
The poll, based on a survey of 396 adults, has a sampling error of 5 percentage points.
A survey of 1,000 adults last week suggests that many people may be making an effort to "buy American," to show patriotism and to support the economy.
A survey of over 400 adults showed approximately 15% morning people, 25% evening people, and 60% intermediates.
In a 1985 survey of 1,019 adults, 80 percent said the procedure was painless and far less complicated and uncomfortable than they had expected.
The national survey of 2,014 adults was conducted June 9-12.
The study was based on a survey of 39,000 adults, including nearly 1,800 on Medicaid.
The survey, of 1,147 adults, was conducted by telephone Jan. 10 to 12.
But the results, based on a survey of 10,000 adults, aren't quite so straightforwardly anti-intellectual.