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Relative Risk = 1: The event is equally likely to occur in each group. Relative Risk > 1: The event is more likely to occur in the treatment group. The following examples show how to interpret relative risk values in practice.
What is Relative Risk? Relative risk is the ratio of the probability of an adverse outcome in an exposure group divided by its likelihood in an unexposed group. This statistic indicates whether exposure corresponds to increases, decreases, or no change in the probability of the adverse outcome.
Relative risk is the ratio of the probability of an event occurring with an exposure versus the probability of the event occurring without the exposure. Thus to calculate the relative risk, we must know the exposure status of all individuals (either exposed or not exposed).
1. What is Relative Risk? 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.
Relative Risk : The event is less likely to occur in the treatment group; Relative Risk = 1: The event is equally likely to occur in each group; Relative Risk > 1: The event is more likely to occur in the treatment group; The following examples show how to interpret relative risk values in practice. Example 1: Relative Risk
In Lesson 2 you learned that risk is often used to describe the probability of an event occurring. Risk can also be used to compare the probabilities in two different groups. First, we'll review risk, then you'll be introduced to the concept of relative risk.
The relative risk of having cancer when in the hospital versus at home, for example, would be greater than 1, but that is because having cancer causes people to go to the hospital. Usage in reporting. Relative risk is commonly used to present the results of randomized controlled trials. [5] .
These examples highlight a common misconception that often erroneously presented (and occasionally taken advantage of by unscrupulous authors) in the scientific literature, namely the statistical concepts of relative vs absolute risk.
However, to truly interpret the severity of a relative risk we have to know the baseline risk. Baseline Risk. The baseline ris k is the denominator of relative risk, i.e., the risk of the group being compared to. In our example, this would be the risk of heart attack for the normal range.
It is your exposure to danger or adverse outcomes. Statistically, we define risk as the probability of a negative outcome occurring, and there are several ways to calculate it. Imagine deciding whether to take a medication to reduce the chances of an illness. Ideally, this decision involves understanding different types of risk.