Absolute risk increase
Absolute Risk Increase
The Absolute Risk Increase (ARI) (pronunciation: /ˈæb.sə.luːt rɪsk ɪnˈkriːs/) is a statistical term used in epidemiology and medical research to measure the absolute difference in risk or rate of a health-related event in a population between exposed and unexposed groups.
Etymology
The term is derived from the English words "absolute", "risk", and "increase". "Absolute" (from Latin absolutus meaning "freed, unrestricted") refers to the total, whole, or complete. "Risk" (from Italian risco meaning "danger") refers to the potential of gaining or losing something of value. "Increase" (from Latin increscere meaning "grow upon, grow over, swell, increase") refers to a growth or augmentation in numbers, size, power, or intensity.
Definition
The Absolute Risk Increase is calculated by subtracting the risk of an event in the control group from the risk in the treatment group. It is often expressed as a percentage. The ARI is used to provide a measure of the increase in risk due to a particular exposure or intervention.
Related Terms
- Relative Risk: The ratio of the probability of an event occurring in an exposed group to the probability of the event occurring in a comparison, non-exposed group.
- Attributable Risk: The difference in rate of a condition between an exposed population and an unexposed population.
- Number Needed to Harm: The number of patients who need to be treated for one to be harmed compared with a control in a clinical trial.
See Also
External links
- Medical encyclopedia article on Absolute risk increase
- Wikipedia's article - Absolute risk increase
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