# Medicine:Preventable fraction for the population

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__: Measure used in epidemiology__

**Short description**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 [math]\displaystyle{ PF_p = (I_p - I_e)/I_p }[/math], where [math]\displaystyle{ I_e }[/math] is the incidence in the exposed group, [math]\displaystyle{ I_p }[/math] 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.

## See also

## References

- ↑ Porta, Miquel, ed (2014). "Dictionary of Epidemiology - Oxford Reference" (in en). pp. 223. doi:10.1093/acref/9780199976720.001.0001. http://www.oxfordreference.com/view/10.1093/acref/9780199976720.001.0001/acref-9780199976720.
- ↑ Rothman, Kenneth J.; Greenland, Sander; Lash, Timothy L. (2012).
*Modern epidemiology*(3rd ed.). Philadelphia: Lippincott Williams & Wilkins. ISBN 9780781755641. OCLC 169455558.

Original source: https://en.wikipedia.org/wiki/Preventable fraction for the population.
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