<P> The rare disease assumption is a mathematical assumption in epidemiologic case - control studies where the hypothesis tests the association between an exposure and a disease . It is assumed that , if the prevalence of the disease is low , then the odds ratio approaches the relative risk . </P>
<P> The rare disease assumption is a mathematical assumption in epidemiologic case - control studies where the hypothesis tests the association between an exposure and a disease . It is assumed that , if the prevalence of the disease is low , then the odds ratio approaches the relative risk . </P>
when does the odds ratio approximate the relative risk
when does the odds ratio approximate the relative risk
prevalence of the disease is low
prevalence of the disease is low