oa South African Family Practice - Making sense of statistics for family practitioners : "what is Odds Ratio?" : review article
Extracted from text ... Making Sense of Statistics Introduction The Odds Ratio (OR) is frequently used in case-control studies. It is the ratio of the odds in favour of getting the disease, if exposed, to the odds in favour of getting the disease, if not exposed. In other words, it is a measure of association, which quantifies the relationship between an exposure and health outcome from a comparative study. For example, in measuring the efficacy of a therapy, odds can be used to describe risk. Since, the odds of an event are the probability of it occurring compared to the probability of it not ..
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