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Article: What are relative risk, number needed to treat and odds ratio?.(Review Article)
- Article from:
- Annals of Indian Academy of Neurology
- Article date:
- October 1, 2007
- Author:
CopyrightCOPYRIGHT 2007 Medknow Publications Pvt. Ltd. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Byline: Kameshwar. Prasad
The effects of an intervention is best measured in a randomized controlled trial (RCT) and can be expressed in various ways using the measures such as risk difference, number needed to treat (NNT), relative risk or odds ratio. Risk difference (RD) is the difference in risk of the outcome event between control and experimental group. Control group is not exposed to the intervention, whereas experimental group is the one that is exposed to intervention. The risk of outcome event in the control group is also called baseline risk. The NNT is the inverse of the risk difference and indicates the number of patients required to be treated to ...
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