Question: how to calculate confidence interval of odds ratio?
Answer: The confidence interval, ci, is calculated as: ci = exp(log(or) ± Zα/2*√1/a + 1/b + 1/c + 1/d), where Zα/2 is the critical value of the Normal distribution at α/2 (e.g. for a confidence level of 95%, α is 0.05 and the critical value is 1.96).