Example: (From Categorical Data Analysis, by A. Agresti, 2002, 3rd edi.) The following table is from a report on the relationship between aspirin use and heart attack by a research group at Harvard Medical School. This was a 5 year randomized study of whether regular aspirin intake reduces mortality from cardiovascular disease. Every other day, physicians participating in the study took either one aspirin or a placebo. The study was blind-those in the study did not know whether they were taking aspirin or a placebo Heart Attack Total 11,034 11,037 22,071 Yes 189 104 293 No 10,845 10,933 21,778 Group Placebo Aspirin Total (Wald confidence interval for odds ratio, 1 pt) Still for heart attach data, use confidence interval of log(ô) (log of odds ratio) to test the effect of aspirin treatment. 4. Example: (From Categorical Data Analysis, by A. Agresti, 2002, 3rd edi.) The following table is from a report on the relationship between aspirin use and heart attack by a research group at Harvard Medical School. This was a 5 year randomized study of whether regular aspirin intake reduces mortality from cardiovascular disease. Every other day, physicians participating in the study took either one aspirin or a placebo. The study was blind-those in the study did not know whether they were taking aspirin or a placebo Heart Attack Total 11,034 11,037 22,071 Yes 189 104 293 No 10,845 10,933 21,778 Group Placebo Aspirin Total (Wald confidence interval for odds ratio, 1 pt) Still for heart attach data, use confidence interval of log(ô) (log of odds ratio) to test the effect of aspirin treatment. 4.