<prompt> Attributable risk is the impoant parameter for:-CliniciansEpidemiologistsPublic health program managersMicrobiologists  <response>: AR Difference in incidence rates of disease or death bw an exposed group non-exposed group. It indicates to what extent the disease under study can be attributed to the exposure. Aka risk difference Excess risk Absolute risk. Used by epidemiologists. Attributable risk is often expressed as a percent. This is given by the formula :Incidence of disease rate among exposed - incidence of disease rate among non-exposed--- --- --- xlOOIncidence rate among exposed - RR - used by Clinicians - PAR -useful for National health programmes and policies 