# Preventable fraction for the population

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.

## References

- "Dictionary of Epidemiology - Oxford Reference". p. 223. doi:10.1093/acref/9780199976720.001.0001. 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.

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