![]() Therefore, computing the confidence interval for a risk ratio is a two step procedure. However, the natural log (Ln) of the sample RR, is approximately normally distributed and is used to produce the confidence interval for the relative risk. The relative risk is a ratio and does not follow a normal distribution, regardless of the sample sizes in the comparison groups. The parameter of interest is the relative risk or risk ratio in the population, RR=p 1/p 2, and the point estimate is the RR obtained from our samples. By convention we typically regard the unexposed (or least exposed) group as the comparison group, and the proportion of successes or the risk for the unexposed comparison group is the denominator for the ratio. A cumulative incidence is a proportion that provides a measure of risk, and a relative risk (or risk ratio) is computed by taking the ratio of two proportions, p 1/p 2. Both measures are useful, but they give different perspectives on the information. The risk difference quantifies the absolute difference in risk or prevalence, whereas the relative risk is, as the name indicates, a relative measure. Confidence Intervals for the Risk Ratio (Relative Risk) ![]()
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