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NPR / KAISER FAMILY FOUNDATION / KENNEDY SCHOOL OF GOVERNMENT
SURVEY ON AMERICANS AND DIETARY SUPPLEMENTS
The results of this survey are based on telephone interviews conducted between February 19 and February 25, 1999, with 1,200 adults 18 years or older nationwide. The margin of error is plus or minus 3 percentage points. For results based on subsets of respondents (Tables 1-7), the margin of error is higher.
The NPR/Kaiser/Kennedy School Poll is a project of National Public Radio, the Henry J. Kaiser Family Foundation, and Harvard University's Kennedy School of Government. Representatives of the three sponsors worked together to develop the survey questionnaire and to analyze the results. In addition to NPR's broadcasts relating to this survey and the information on this web page, the Kaiser Family Foundation and the Kennedy School may publish independent summaries of the findings. Each organization bears sole responsibility for information appearing under its name.
The project team includes NPR Special Projects Editor Marcus D. Rosenbaum; Robert J. Blendon, a Harvard University professor who holds joint appointments in the School of Public Health and the Kennedy School of Government, and John Benson, deputy director for public opinion and health/social policy at the Harvard School of Public Health; and Drew Altman, president, Matt James, senior vice president, and Mollyann Brodie, vice president and director of public opinion and media research for the Kaiser Family Foundation, a nonprofit organization that sponsors research into health care and other public policy issues.