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The survey, which was commissioned by Dunkin' Donuts and CareerBuilder.com in honor of National Coffee Day Sept. 29, found 55 percent of respondents said they drink at least one cup of coffee per day and 63 percent of coffee drinkers tend to have two or more cups of java during the workday.
The survey had a margin of error of 1.52 percentage points with a 95 percent probability.