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Pref = Prevalence of the outcome in the reference group Stack Exchange Network Stack Exchange network consists of 178 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their Example (same example, but we will compute the odds ratio instead of the risk ratio) OR= (992/2260) / (165/1017) = 0439/0162 = 271 Step 1 Find the natural log of OR Step 2 Find the confidence limits on the natural log scale Step 3 Convert the log limits back to a linear scale by exponentiating them
