Medicine: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 [math]PF_p = (I_p - I_e)/I_p[/math], where [math]I_e[/math] is the incidence in the exposed group, [math]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.

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https://en.wikipedia.org/wiki/Preventable fraction for the population was the original source. Read more.