Search results
What is Relative Risk? Relative risk compares the probability of a specific event (such as developing a disease) occurring in two distinct groups: those exposed to a certain risk factor versus those not exposed. It quantifies how much more (or less) likely the event is to happen in the exposed group compared to the unexposed group.
- Example 1: Relative Risk < 1
- Example 2: Relative Risk = 1
- Example 3: Relative Risk > 1
- Interpreting Relative Risk in A Contingency Table
- Additional Resources
Suppose we want to know if exercise affects the risk of developing some disease. We collect data and find that 28% of people who exercise regularly develop this disease while 50% of people who do not exercise regularly develop this disease. In this scenario, we would calculate the relative risk as: 1. Relative Risk = P(event in treatment group) / P...
Suppose we want to know if some new studying program affects the ability of students to pass a particular exam. We collect data and find that 40% of students who use the new studying program pass the exam while 40% of students who do not use the studying program also pass the exam. In this scenario, we would calculate the relative risk as: 1. Relat...
Suppose we want to know if smoking affects the risk of developing lung cancer We collect data and find that 70% of people who smoke develop lung cancer while 5% of people who do not smoke develop lung cancer. In this scenario, we would calculate the relative risk as: 1. Relative Risk = P(event in treatment group) / P(event in control group) 2. Rela...
Often you may have to calculate and interpret relative risk using a 2×2 table, which takes the following format: We can use the following formula to calculate relative risk in a 2×2 table: Relative risk= [A/(A+B)] / [C/(C+D)] For example, suppose 50 basketball players use a new training program and 50 players use an old training program. At the end...
The following tutorials offer additional information about odds ratios and relative risk: How to Interpret Odds Ratios How to Calculate Odds Ratio and Relative Risk in Excel
Apr 24, 2024 · While the odds ratio assesses the risk or association in general, the relative risk is commonly used to assess causation. This is because it shows how much more or less likely people exposed to a factor are to develop a disease compared to those who are not exposed.
Aug 9, 2023 · Risk factors that have a large effect, or are common in the population, can help us understand which interventions would make a big difference. But how can we measure the risk that a given factor has on the outcomes we care about? In this article, I’ll explain this with a simple example. I’ll focus on a hypothetical risk factor – a toxic ...
Sep 3, 2024 · Relative risks are specific to the study, absolute risks are generalized to the population. Number needed to treat (NNT) is a way to communicate absolute risk reductions.
When comparing two groups, absolute risk is most simply thought of as the difference between two risks, while relative risk is the ratio between two risks. Relative risk is more correctly thought of as a “risk ratio” due to the nature of the mathematical ratios involved.
People also ask
How do you calculate relative risk?
What is a relative risk based on the odds ratio?
What are odds and relative risk in epidemiology?
What is the difference between attributable risk and relative risk?
What is the difference between attributable risk and odds ratio?
What is the difference between relative risk and absolute risk?
Apr 9, 2017 · The attributable risk (AR) is related to the relative risk but, while relative risk represents the ratio of the incidence rates, AR is the difference between these rates. Measures of impact such as AR estimate how much of the disease would be prevented if the risk factor was removed from the population.
