A case-control study was conducted to evaluate the relationship between artificial sweeteners and bladder cancer. 3,000 cases and 3,000 controls were enrolled in the study. Amongst the cases, 1,293 had used artificial sweeteners in the past, while 1,707 had never used artificial sweeteners. Among the controls, 855 had used sweeteners and 2,145 had not. Compute the appropriate measure of association, and round off the answer to the nearest tenth (one decimal place) Calculate the confidence interval for the measure of association. round to nearest hundredth (two decimal places). The lower limit is , and the upper limit is