Understanding The Concept Of Population Attributable Risk

## Question

What is population attributable risk? and what is the formula used.

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Population Attributable Risk (PAR) is a measure used in epidemiology to estimate the proportion of cases in a population that can be attributed to a specific exposure. It is calculated by comparing the incidence of disease among those exposed to a risk factor to the incidence of disease in the entire population, and quantifying the difference between the two. Understanding The Concept Of Population Attributable Risk

The formula used to calculate population attributable risk is:

**PAR = P(E) x [RR – 1] / [1 + P(E) x (RR – 1)]**where: P(E) = prevalence or proportion of the population exposed to the risk factor RR = relative risk of disease associated with the exposure to the risk factor In this formula, the term [RR – 1] represents the excess risk of disease associated with the exposure to the risk factor, compared to those who are not exposed. The numerator, P(E) x [RR – 1], calculates the number of cases of the disease that can be attributed to the exposure, and the denominator, [1 + P(E) x (RR – 1)], is the total number of cases in the population.Step 2/2

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**Final answer**

**(PAR = P(E) x [RR – 1] / [1 + P(E) x (RR – 1)]**takes into account the prevalence of the exposure and the relative risk of disease associated with the exposure. PAR is a useful measure in epidemiology and public health research, as it can inform public health policies and interventions aimed at reducing the incidence of the disease Understanding The Concept Of Population Attributable Risk