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Lastly, we have to take into account that odds (unlike risks) are rather difficult to understand, particularly for readers that are not particularly trained in statistics The risk of an event is a very simple concept it is the ratio between the number of subjects who experience the event and the total number of subjects at riskCalculation of probability (risk) vs odds In statistics, odds are an expression of relative probabilities, generally quoted as the odds in favor The odds (in favor) of an event or a proposition is the ratio of the probability that the event will happen to the probability that the event will not happenOdds Ratio (OR) measures the association between an outcome and a treatment/exposure Or in other words, a comparison of an outcome given two different groups (exposure vs absence of exposure) OR is a comparison of two odds the odds of an outcome occurring given a treatment compared to the odds of the outcome occurring without the treatment Odds Ratio Relative Risk R