Questions 9-11: Results of a case control study designed to examine the association befween high blood pressure (hypertenslon) and the risk of stroke In adult males are shown In the following table. Status Cases of Stroke Controls High Blood Pressure 300 200 Normal Blood Pressure 100 200 9. What is the maln measure of Interest in this study? O B. Odds Ratio. A Relative Risk. HD. Difference in the frequency of high blood pressure for the cases versus the controls. C. Difference in the incidence of stroke for those with and without high blood pressure.