Pearson’s chi-squared statistic (includes Yates’ continuity correction) = 0.423; value using Fisher’s exact test (1 degree of freedom) = 0.484; estimate of odds ratio = 1.248; 95% confidence limits for true odds ratio = [0.72, 2.166]; estimate of risk difference () in case-control studies = 0.055; 95% confidence limits for risk difference = [0.006, 0.105].