A 12 year cohort study was conducted to examine the association between periodontitis gum disease and myocardial infarctions heart attacks in a representative sample of older adults Among 7 500 adults with periodontitis 174 suffered a myocardial infarction Among the 37 500 adults free of periodontitis 344 new cases of myocardial infarction were observed over the study period Show your work Use per 1 000 where appropriate Remember to include proper UNITS cases per population per study period What is the incidence of myocardial infarction among adults free of periodontitis