In the MMWR Recommendations and Reports, "A Framework for
Assessing the Effectiveness of Disease and Injury Prevention,"
dated March 27, 1992, the last paragraph on page 7 gives a formula
for prevented fraction. In the formula, P1 is the proportion of the
cases that accepts the intervention, PF is the prevented fraction,
and RR is the relative risk. The formula for a population-based
study is PF=P(1-RR), where P is the proportion of the entire
population that accepts the intervention.
Disclaimer
All MMWR HTML versions of articles are electronic conversions from ASCII text into HTML. This conversion may have resulted in character translation or format errors in the HTML version. Users should not rely on this HTML document, but are referred to the electronic PDF version and/or the original MMWR paper copy for the official text, figures, and tables. An original paper copy of this issue can be obtained from the Superintendent of Documents, U.S. Government Printing Office (GPO), Washington, DC 20402-9371; telephone: (202) 512-1800. Contact GPO for current prices.
**Questions or messages regarding errors in formatting should be addressed to mmwrq@cdc.gov.
