<prompt> Difference b w the incidence in exposed and non exposed group is best given byrelative riskattributable riskpopulation attributable riskodds ratio  <response>: attributable risk : Attributable RiskAR sometimes called Attributable Propoion or Attributable Fraction is a measure of the prevalence of a condition or disease. Given a group of people exposed to a risk, it;s the fraction who develop a disease or condition. ref : park 21st ed 