Population Attributable Risk (PAR) is the porportion of the incidence of a disease in the population (exposed and nonexposed) that is due to exposure. ... It is the incidence of a disease in the population that would be eliminated if exposure were eliminated (1, 2).

How do you calculate population attributed risk?

Attributable risk (PAR)

It is the incidence of the disease in the population that would be eliminated if exposure were eliminated. PAR is computed by subtracting the incidence in the unexposed (Io) from the incidence in the total population (exposed and unexposed) [Ip].

How do you explain attributable risk?

Attributable risk (AR) is a measure of the proportion of the disease occurrence that can be attributed to a certain exposure. The risks among the exposed and unexposed groups are denoted p₁ and p₂. AR can then be expressed by estimating excess risk as p 1 − p 2 divided by the risk for the exposed group, p₁, i.e., (9.9)