# 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 ${\displaystyle PF_{p}=(I_{p}-I_{e})/I_{p}}$, where ${\displaystyle I_{e}}$ is the incidence in the exposed group, ${\displaystyle I_{p}}$ 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

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