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Explain why it is not possible to use the PAR formula for a cohort study to...

Explain why it is not possible to use the PAR formula for a cohort study to calculate the PAR for a case control study?

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Answer #1

PAR is the proportion of disease in a population which can be prevented by eliminating causal exposure or risk factor from population & generally can be expressed as a percentage.

PAR can be estimated from case-control or cross sectional studies using formulae that combine the prevalence of exposure to a risk factor and a measure of the impact of that risk factor on the development of disease. It is not possible to use the PAR formula for cohort study because in a cohort study the outcome measure is the risk ratio/relative risk. In cohort study exposed and unexposed groups get recruited from the same source population.

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