# Preventable fraction for the population

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In epidemiology, **preventable fraction for the population** (PFp), is the proportion of incidents in the population that could be prevented by exposing the whole population. It is calculated as , where is the incidence in the exposed group, is the incidence in the population.^{[1]}^{[2]}

It is used when an exposure reduces the risk, as opposed to increasing it, in which case its symmetrical notion is attributable fraction for the population.^{[citation needed]}

## See also

[edit]## References

[edit]**^**Porta, Miquel, ed. (2014). "A Dictionary of Epidemiology".*Dictionary of Epidemiology - Oxford Reference*. Oxford University Press. p. 223. doi:10.1093/acref/9780199976720.001.0001. ISBN 9780199976720. Retrieved 2018-05-09.**^**Rothman, Kenneth J.; Greenland, Sander; Lash, Timothy L. (2012).*Modern epidemiology*(3rd ed.). Philadelphia: Lippincott Williams & Wilkins. ISBN 9780781755641. OCLC 169455558.