Difference Between Odds Ratio and Relative Risk

The relative risk (also known as risk ratio [RR]) is the ratio of risk of an event in one group (e.g., exposed group) versus the risk of the event in the other group (e.g., 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.

1. Are odds ratio and relative risk the same?
2. How do you find relative risk from odds ratio?
3. What is the difference between relative risk and risk difference?
4. Why are the relative risk and odds ratio approximately equal?
5. What does a risk ratio of 0.75 mean?
6. What does an odds ratio of 2.5 mean?
7. What is Relative Risk example?
8. How do you interpret relative risk?
9. How do you interpret odds ratio?
10. What does a relative risk of 1.5 mean?
11. What does a relative risk of 2.5 mean?
12. What does a relative risk of 0.9 mean?

Are odds ratio and relative risk the same?

Odds Ratios and Relative Risks are often confused despite being unique concepts. ... 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).

How do you find relative risk from odds ratio?

Relative risk comparing treatment with control: (a×(b+d))/(b×(a+c)) For both the odds ratio and relative risk, 1 represents no difference between the groups. The risk (and the odds) does not have to refer to an undesirable outcome.

What is the difference between relative risk and risk difference?

Relative risk comparisons and risk differences provide two different perspectives on the same information. Relative risk , i.e., risk ratios, rate ratios, and odds ratios, provide a measure of the strength of the association between a factor and a disease or outcome. Risk difference , i.e., absolute risk,.

Why are the relative risk and odds ratio approximately equal?

If there's absolutely no difference between the groups in the probability of an outcome, then both the OR and the RR are 1.0. That's the only situation in which they can be exactly equal.

What does a risk ratio of 0.75 mean?

The interpretation of the clinical importance of a given risk ratio cannot be made without knowledge of the typical risk of events without treatment: a risk ratio of 0.75 could correspond to a clinically important reduction in events from 80% to 60%, or a small, less clinically important reduction from 4% to 3%.

What does an odds ratio of 2.5 mean?

If odds ratio is 2.5, then there is a 2.5 times higher likelihood of having the outcome compared to the comparison group. ... Here the odds ratio would be 0.80. The odds ratio also shows the strength of the association between the variable and the outcome.

What is Relative Risk example?

The relative risk (also called the risk ratio) of something happening is where you compare the odds for two groups against each other. For example, you could have two groups of women: one group has a mother, sister or daughter who has had breast cancer.

How do you interpret relative risk?

A relative risk of one implies there is no difference of the event if the exposure has or has not occurred. If the relative risk is greater than 1, then the event is more likely to occur if there was an exposure. If the relative risk is less than 1, then the event is less likely to occur if there was an exposure.

How do you interpret odds ratio?

Odds Ratio is a measure of the strength of association with an exposure and an outcome.

1. OR > 1 means greater odds of association with the exposure and outcome.
2. OR = 1 means there is no association between exposure and outcome.
3. OR < 1 means there is a lower odds of association between the exposure and outcome.

What does a relative risk of 1.5 mean?

For example, a relative risk of 1.5 means that the risk of the outcome of interest is 50% higher in the exposed group than in the unexposed group, while a relative risk of 3.0 means that the risk in the exposed group is three times as high as in the unexposed group.

What does a relative risk of 2.5 mean?

0.1 = 2.5. This means that. those in the control group were 2.5 times more likely to die than those in the treatment group. The relative risk is interpreted in terms of the risk of the group in the numerator.

What does a relative risk of 0.9 mean?

Relative risk is an important and commonly used term. An RR of 1.00 means that the risk of the event is identical in the exposed and control samples. An RR that is less than 1.00 means that the risk is lower in the exposed sample. An RR that is greater than 1.00 means that the risk is increased in the exposed sample.