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If Risk = 1, OR = InfinityThe relative risk and the odds ratio are measures of association between exposure status and disease outcome in a population Relative risk In epidemiology, relative risk (RR) can give us insights in how much more likely an exposed group is to develop a certain disease in comparison to a nonexposed group Once we know the exposure and disease status of a research population,The relative risk (RR) and the odds ratio (OR) are the two most widely used measures of association in epidemiology The direct computation of relative risks is

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Odds ratio vs risk reduction-Metodoloˇski zvezki, Vol 13, No 1, 16, 5967 Odds Ratio, Hazard Ratio and Relative Risk Janez Stare1 Delphine MaucortBoulch2 Abstract Odds ratio (OR) is a statistic commonly encountered in professional or scientific Risk Ratio vs Odds Ratio Whereas RR can be interpreted in a straightforward way, OR can not A RR of 3 means the risk of an outcome is increased threefold A RR of 05 means the risk is cut in half But an OR of 3 doesn't mean the risk is threefold;

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If Risk = 05, OR = 1;About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How works Test new features Press Copyright Contact us Creators The relative risk of losing weight by choosing diet A over diet B is 1125, while the odds ratio is about 225 The reasons a medical article might choose one method of reporting over the other are complex, but the message here is that sorting that out starts by being clear about the difference between probability and odds

 √1000以上 odds ratio vs relative risk usmle Odds ratio vs relative risk usmle Percent decrease = (1 – Risk Ratio upper bound) x 100 It's worth stating again when comparing two proportions close to 1 or 0, the risk ratio is usually a better summary than the raw difference Odds Ratios We now turn to odds ratios as yet another way to summarize a 2 x 2 table Odds are another way of expressing the likelihood of Lifetime odds of death for selected causes, United States, 19;

 To the Editor Dr Norton and colleagues 1 described significant limitations of odds ratios (ORs) but they did not report one important advantage of ORs compared with risk ratios (RRs) the magnitude of the association between an exposure and a dichotomous outcome is invariant to whether the outcome is defined as event occurrence (eg, death) or nonoccurrence INTRODUCTION Odds ratio (OR) and risk ratio (RR) are two commonly used measures of association reported in research studies In crosssectional studies, the odds ratio is also referred to as the prevalence odds ratio (POR) when prevalent cases are included, and, instead of the RR, the prevalence ratio (PR) is calculated The basic difference is that the odds ratio is a ratio of two odds (yep, it's that obvious) whereas the relative risk is a ratio of two probabilities (The relative risk is also called the risk ratio) Let's look at an example Relative Risk/Risk Ratio Suppose you have a school that wants to test out a new tutoring program

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The relative risk is best estimated using a population sample, but if the rare disease assumption holds, the odds ratio is a good approximation to the relative risk — the odds is p / (1 − p), so when p moves towards zero, 1 − p moves towards 1, meaning that the odds approaches the risk, and the odds ratio approaches the relative riskThe risk ratio (or relative risk) is the ratio of the risk of an event in the two groups, whereas the odds ratio is the ratio of the odds of an event (see Box 92a) For both measures a value of 1 indicates that the estimated effects are the same for both interventions Odds can be expressed as a ratio of the probability an event will happen divided by the probability an event won't happen Odds in favor of A = A / (1 A), usually simplified to lowest terms, For instance, if the probability of an event occurring is 075, then the odds for it happening are 075/025 = 3/1 = 3 to 1 for, while the probability that it doesn't occur is 1 to 3 against

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 For both risk and odds, the lower limit is 0 For any level of risk or odds under no exposure, multiplication by a risk or odds ratio less than 1 will produce a risk or odds given exposure that is possible 0 to 1 for risks and 0 to infinity for odds Thus, a constant risk or odds ratio is possible for ratios less than 1Sometimes, we see the log odds ratio instead of the odds ratio The log OR comparing women to men is log(144) = 036 The log OR comparing men to women is log(069) = 036 log OR > 0 increased risk log OR = 0 no difference in risk log OR < 0 decreased risk Odds Ratio 0 5 10 15 More on the Odds Ratio Log Odds Ratio4 2 0 2 4The more common the disease, the larger is the gap between odds ratio and relative risk In our example above, p wine and p no_wine were 0009 and 0012 respectively, so the odds ratio was a good approximation of the relative risk OR = 0752 and RR = 075 If the risks were 08 and 09, the odds ratio and relative risk will be 2 very different numbers OR = 044 and RR = 0 Relative risk vs Odds

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In the "risk" of response and a 60% increase in the "risk" of remission Risk, therefore, is used to reflect probability, regardless of the desirability or undesirability of an event 2 Relative risk is an important and commonly used Odds Ratio Odds ratio vs relative risk Odds ratios and relative risks are interpreted in much the same way and if and are much less than and then the odds ratio will be almost the same as the relative risk In some sense the relative risk is a more intuitive measure of effect size Note that the choice is only for prospective studies were the distinction Remember that in a true casecontrol study one can calculate an odds ratio, but not a risk ratio However, one can calculate a risk difference (RD), a risk ratio (RR), or an odds ratio (OR) in cohort studies and randomized clinical trials

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A fractional listing of 6/1 (sixtoone) odds would mean that you win $6 against every $1 you wager, in addition to receiving your dollar back (ie, the amount you wagered)The odds ratio is defined as the ratio of the odds of an event or disease occurring in one group to the odds occurring in another group The standard formula is X / ( 1 − X) / Y / ( 1 − Y), where X and Y are the probability of that event in the two groups, respectively In contrast, the relative risk is the risk of an event or diseaseOdds ratios (OR) are commonly reported in the medical literature as the measure of association between exposure and outcome However, it is relative risk that people more intuitively understand as a measure of association Relative risk can be directly determined in a cohort study by calculating a risk ratio (RR)

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The difference between odds and risk is small when the event is rare (as illustrated in the first example above where a risk of 0091 was seen to be similar to an odds of 01) When events are common, as is often the case in clinical trials, the differences between odds and risks are largeThe odds ratio ((a/c)/(b/d)) looks at the likelihood of an outcome in relation to a characteristic factor In epidemiological terms, the odds ratio is used as a point estimate of the relative risk in retrospective studies Odds ratio is the key statistic for most casecontrol studiesIn biomedical research, we are often interested in quantifying the relationship between an exposure and an outcome "Odds" and "Risk" are the most common terms which are used as measures of association between variables In this article, which is the fourth in the series of common pitfalls in statistical analysis, we explain the meaning of risk and odds and the difference between the two

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 A risk ratio of 10 indicates identical risk among the two groups A risk ratio greater than 10 indicates an increased risk for the group in the numerator, usually the exposed group A risk ratio less than 10 indicates a decreased risk for the exposed group, indicating that perhaps exposure actually protects against disease occurrence Odds ratio the ratio of cross products This is not true for relative risk Switching the rows or columns inverts the odds ratio For example, the odds ratio for no cough given a history of bronchitis = (247/26)/(1002/44) = 0417 = 1/2397 This is the reciprocal of the OR for coughThe risk ratio (or relative risk) is the ratio of the risk of an event in the two groups, whereas the odds ratio The primary difference between odds and probability is that while odds is a ratio of occurrence to nonoccurrence, the probability is the ratio of occurrence to the whole Odds are expressed in the ratio, the probability is either written in percentage form or in decimal

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 The odds ratio (OR) is the ratio of the odds of cancer in smokers to the odds of cancer in nonsmokers OR = (a/b)/(c/d) = (ad)/(bc) The risk ratio (RR), also called the relative risk, is the ratio of the probability of cancer in smokers to the probability of cancer in nonsmokers RR = (a/(ab))/(c/(cd)) = (a(cd))/(c(ab))Cause of Death Odds of Dying; The odds ratio will be greater than the relative risk if the relative risk is greater than one and less than the relative risk otherwise In the example above, if the adjusted odds ratio were interpreted as a relative risk, it would suggest that the risk of antibiotic associated diarrhoea is reduced by 75% for the intervention relative to the

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Heart disease 1 in 6 Cancer 1 in 7 All preventable causes of death 1 in 24 Chronic lower respiratory disease 1 in 27 Suicide 1 in Opioid overdose 1 in 92 Fall 1 in 106 Motorvehicle crash 1 in 107 Gun assault 1 in 2 Pedestrian incident 1 in 543 Motorcyclist 1 Risk Odds When Rolling 3 Dice against 2 When rolling 3 attacking dice against 2 defending dice attacker wins 2 3717% attacker wins 1,Odds Ratio, Relative Risk, and Risk Difference How to Use Odds Ratio, Relative Risk, and Risk Difference to Describe the Association Between Two Categorical

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 Odds Ratios vs Risk Ratios Posted on by StatsBySlough From the previous post, we understand that Odds Ratios (OR) and Risk Ratios (RR) can sometimes, but not always be interpreted in the same way We even saw that scientific studies made the mistake of interpreting odds ratios as risk ratios For instance, odds are a symmetric measure, meaning that while risk only examines outcomes given interventions, odds can also examine interventions given outcomes Thus, a study can be constructed where, rather than choosing trial groups and measuring outcomes, outcomes can be chosen, and other factors can be analyzedRather the odds is threefold greater Interpretation of an OR must be in terms of odds, not

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 The difference between odds ratio and risk ratio While Risk Ratio is the probability of one thing divided by the probability of another (usually in a separated group), Odds Ratio is the odds of one event happening divided by the odds of another EssoeOdds1Risk factor for the disease • Less than 10 indicates that the odds of exposure among casepatients are lower than the odds of exposure among controls The exposure might be a protective factor against the disease The magnitude of the odds ratio is called the "strength of the association" The further away an odds ratio is For example an odds of 01 is written as 110 and an odds of 5 is written as 51 Risk and risk ratios are more commonly used than odds and odds ratios in medicine as these are much more intuitive Risk describes the probability of an event occurring

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The odds ratio is a common measure of risk but its interpretation may be hazardous The risk ratio is a ratio of probabilities, which are themselves ratios The numerator of a probability is the number of cases with the outcome, and the denominator is the total number of cases You know the difference between risk and odds A risk is the proportion of subjects with an event in a total group of susceptible subjects Thus, we can calculate the risk of having a heart attack among smokers (infarcted smokers divided by the total number of smokers) and among nonsmokers (the same, but with nonsmokers)That is defined as p/(1p) That is if p is the probability of the event of interest and (1p) is the probability that it doesn't happen So even from this simple case we see that the risk varies from 0 to 1 and the odds vary from 0 to infinity In fact, if Risk (or p) < 05, OR < 1;

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A terminology problem odds ratio versus odds Author William Gould, StataCorp James Hardin, StataCorp Unfortunately, the language used to describe statistical terms is not used uniformly across fields One example of this is odds and odds ratio Economists especially refer to what others call the odds as the odds ratioRisks and Odds When talking about the chance of something happening, eg death, hip fracture, we can talk about • risk and relative risk or • odds and odds ratio Risks and odds Risks and odds Risks A proportion Numerator / Denominator Odds A ratio Numerator / (Denominator Numerator) 2 Two by two table

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