The homemade video abstract on the BMJ website shows you the difference between odds and risk, and how one odds ratio can mean several different relative risks (RRs), depending on the risk in one of the groups Unfortunately, in some situations, you just have to get an OR, notably logistic regression and retrospective casecontrol studiesSimilar to relative risk, the odds ratio for exposure is equal to a/c divided by b/d Similar to the odds ratio for exposure, the odds ratio for disease is equal to a/b divided by c/d, where a/b represents the odds for disease in those exposed to the risk and c/d represents the oddsThe Relative Risk Ratio and Odds Ratio are both used to measure the medical effect of a treatment or variable to which people are exposed The effect could be beneficial (from a therapy) or harmful (from a hazard) Risk is the number of those having the outcome of interest (death, infection, illness, etc) divided by the total number exposed to
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