National Survey on Public Attitudes and Use of Dietary Supplements
The NPR/Kaiser Family Foundation/Kennedy School of Government National Survey on Americans and Dietary Supplements was designed by staff at National Public Radio, Kaiser Family Foundation, and the Kennedy School of Government and conducted by Princeton Survey Research Associates. The survey was conduced bytelephone with 1,200 adults (age 18 or older) nationwide between February 19 andFebruary 25, 1999. The margin of sampling error is plus or minus 3 percentagepoints.