A commercial for "Degree Clinical Protection" deodorant said: "Do you know one in four people think they sweat more than normal?"
So another one in four people are in denial, since the number of people who sweat more than normal is probably about half. (I'm assuming that "sweating more than normal" is the sort of thing one would deny, which seems reasonable, at least in the perspective of a deodorant commercial.)
I'm reminded of the often-quoted fact that three-quarters of all incoming students at [insert prestigious university here] think they're going to be in the top quarter of their incoming fact.
(The amazon.com page has a description beginning "Did you know one in four Americans worry about excessive sweating?", which I don't have a problem with, because the word "excessive" doesn't have the same statistical connotations.)