Definition of risk ratio A risk ratio (RR), also called relative risk, compares the risk of a health event (disease, injury, risk factor, or death) among one group with the risk among another group It does so by dividing the risk (incidence proportion, attack rate) in group 1 by the risk (incidence proportion, attack rate) in group 2Odds ratio vs Relative Risk/Hazard Ratio I have a background in physics with a few courses in statistics, but I still have a hard time intuitively understanding OR I get RR as it just is a ratio of probabilities, and I look at HR as RR with a time componentRelative risk, odds ratio, risk ratio, risk difference these are all measures of the direction and the strength of the association between two categorical variables Can I
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Odds ratio vs relative risk interpretation
Odds ratio vs relative risk interpretation-The odds ratio (OR) is a ratio of 2 numbers, like the relative risk we have 3 options OR = 1 The odds in the first group are the same as those in the second So no evidence that drinking wine can either OR >Click on the article title to read more
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Relative Risk and Odds Ratio for the obese 3) Overall, you can see that decreasing the baseline incidence will decrease the odds ratio (300 in those who are nonobese versus 129 in those who are obese) Obviously, these results run counterRE st odds ratio vs RRR in multinomial logistic regression Thanks this is very helpful One more question With odds ratios in binary logistic regression, you can easily interpret the exponentiated coefficient by stating that the odds of outcome 1 are 24 times greater than the odds of outcome 2 When I expoentiate the coefficient inOdds 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 becomes important in cases of
And how just a few letters in the code fitting a generalized linear model mean the difference between extracting one or the other There are plenty of other explanThe risk of failure with SF was 96/351 (27%) vs 32/350 (9%) with HP The RR was 3 This has a very intuitive meaning risk of failure with SF was three times more likely than HP Odds Ratio The OR is a way to present the strength of association between riskThe difference between odds ratio and risk ratio • ericminikel The other day I was emailing with a statistical genetics colleague about a rare SNP associated with a phenotype I stated that the minor allele frequency (MAF) was 07% in cases and 01% in controls, for a risk ratio of 7 After clicking send, I felt a twinge of regret
Both the odds ratio and the relative risk compare the relative likelihood of an event occurring between two groups The relative risk is easier to interpret and is consistent with general intuition Some designs, however, allow only for the calculation of the odds ration Covariate adjustment is easier for an odds ratioOdds ratio relative risk Relative risk An odds ratio is a ratio of two odds Relative risk isPref = Prevalence of the outcome in the reference group oddsratio relativerisk Share Improve this question edited May 24 at 1733 kjetil b halvorsen ♦ 59k 23 23 gold badges
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Odds 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 rRisk = odds/ (1odds) "Most published research providing an odds ratio as a measure of effect size should also provide sufficient information for the baseline risk, and hence the relative risk, to be calculated If numbers in each group are given, the crude relative risk can be calculated directly" – BMJ 14;348f7450 doi /bmjRR=OR/ ( (1−Pref) (Pref∗OR)) RR = risk ratio;
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Portantly, we see that the odds ratio is close to the relative risk if probabilities of the outcome are small (Davies et al, 1998) And it is this fact that enables us, most of the time, to approximate the relative risk with the odds ratio Table 5 below illustrates the relationship between RR and OR for some probabilities of the outcome1 The odds of having the disease in the exposed group areIt is assumed that, if the prevalence of the disease is low, then the odds ratio approaches the relative risk Case control studies are relatively inexpensive and less timeconsuming than cohort studies In this case the odds ratio (OR) is equal to 16 and the relative risk (RR) is equal to 865
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Relative risk is actually the ratio between incidence of outcome/disease among exposed people and that among unexposed people It is usually used in a cohort study where there is a definite population under study and we can calculate incidence rates Hence it is a direct and accurate value compared to odds ratioAnother measure we can find is oddsThe 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
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Understanding Relative Risk, Odds Ratio, and Related Terms As Simple as It Can Get Chittaranjan Andrade, MD ABSTRACT Risk, and related measures of effect size (for categorical outcomes) such as relative risks and odds ratios, are frequently presented in research articles Not all readers know how these statistics1 Answer1 Odds ratio and relative risk are two measures used to describe the likelihood of an event happening 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 probabilitySee all my videos at https//wwwzstatisticscom/videos/Health Stats IQ playlisthttps//youtubecom/playlist?list=PLTNMv857s9WUI5YsQMW14trmbopjZMWPa000 Int
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The literature dealing with the relation between relative risk and odds ratio is quite exten sive (some examples are (Da vies et al, 1998;Risk is often a more intuitive concept than odds, and thus understanding relative risks is often preferred to understanding relative odds However, OR does not suffer from the same causal assumption limitations as RR, making it more widely applicableRELATIVE RISK AND ODDS RATIO The relative risk (also known as risk ratio RR) is the ratio of risk of an event in one group (eg, exposed group) versus the risk of the event in the other group (eg, nonexposed group) The odds ratio (OR) is the ratio of odds of an event in one group versus the odds of the event in the other group
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Relative survival and causespeci c survival attempt to estimate Hazard Ratio Age group Causespeci c HR Pvalue 95% CI 1859 100 hazards is the risk setFor the causespeci c hazard the risk set decreases each time there is a death from another cause censoring Odds ratio (OR) is a statistic commonly encountered in professional or scientific medical literatureRisk is the number of those having the outcome of interest (death, infection, illness, etc) divided by the total number exposed to the treatment Odds is the number having the outcome divided by the number not having the outcome The risk or odds ratio is the risk or odds in the exposed group divided by the risk or odds in the control groupRELATIVE RISK AND ODDS RATIO Risk and Odds just seemed the same to me for a long time Since then, I have come to understand to important difference Lets start with Relative Risk Relative Risk can be addressed by asking the following question How many times more likely is an exposed group to develop a
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Why are the relative risk and odds ratio approximately equal?The odds ratio is extremely important, however, as it is the only measure of effect that can be computed in a casecontrol study design When the outcome of interest is relatively rare (<10%), then the odds ratio and relative risk will be very close in magnitudeYou may have noticed that the odds ratio and relative risk are very similar in this case This happens when the proportions being compared are both close to 0 Which one you decide to use is a matter of personal preference and perhaps your audience
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ELI5 odds ratio vs relative risk Google search has plenty, but none are ELI5 I'm reading a medical journal which says if a baby poops in the amniotic sac (meconium), the odds ratio for it having problems after birth (respiratory, heart, etc) is 364The 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 groupThe odds ratio and the relative risk will not always disagree by this much Large effects on groups with high initial risk seem to cause the most problems See Davies et al (1998) for some useful guidelines for when the odds ratio and relative risk are likely to differ When they do differ, the relative risk represents the typical interpretation
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Relative Risk (RR) &Risk vs odds The terms 'risk' and 'odds' are often used interchangeably but they actually have quite different implications and are calculated in different ways Odds is a concept that is very familiar to gamblers It is a ratio of probability that a particular event will occur and can be any number between zero and infinityOR = odds ratio;
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Figure 1 Relationship between Odds Ratio and Relative Risk for various incidence rates 38 8 166 Int J Public Health 53 (08) 165–167 When to use the odds ratio or the relative risk?Odds Ratio vs Relative Risk What's the Difference?This post tries to explain the difference between odds ratios and relative risk ratios;
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Since relative risk is a more intuitive measure of effectiveness, the distinction is important especially in cases of medium to high probabilities If action A carries a risk of 999% and action B a risk of 990% then the relative risk is just over 1, while the odds associated with action A are more than 10 times higher than the odds with BOdds Ratio (OR) The difference between odds and probability is important because Relative Risk is calculated with probability and Odds Ratio is calculated with odds Relative Risk (RR) is a ratio of probabilities or put another way it is one probability divided by another Odds Ratio (OR) is a ratio or proportion of oddsRisk is often a more intuitive concept than odds, and thus understanding relative risks is often preferred to understanding relative odds However, OR does not suffer from the same causal assumption limitations as RR, making it more widely applicable
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Relative Risk vs Odds ratioOdds ratio or relative risk While there is a conceptual relationship between these measures, they are still different enough that you should probably report separate pooled estimates for the studies using a hazard ratio and the studies using odds ratios/relative risks Steve Simon, Standard DisclaimerRelative Risk and Odds Ratios In the population under investigation, relative risk refers to a ratio between members of the population expressing the trait of interest (eg cancer), with distinction made between whether or not those members had previously been exposed to a related risk
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9222 Measures of relative effect the risk ratio and odds ratio Measures of relative effect express the outcome in one group relative to that in the other The 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 effectsThe person would have about a 1% chance of a heart attack if they didn't improve their health In both cases the relative risk was 5, but with entirely different levels of impact Please note this example is not meant to be interpreted that taking care of your health is not important!!!
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6 7 8 9 10 11 12 13 14 15 16 17 18 19 21 22 23 24 25 26 27 28 29 30 Review Incidence And Prevalence Are Formally Defined On Slide 7 Birth And Death Rates Are Also Estimates Of Absolute Risk Risk Factors Are Identified By Determining
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9 10 11 12 13 14 15 16 17 18 19 21 22 23 24 25 26 27 28 29 30 Review Odds Ratios Are Calculated From Case Control Studies Which Are Described On Slide 14 Odds Ratios Are Only Estimates Of Relative Risks Since True Incidence Rates Cannot Be
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