Number needed to treat to benefit

An estimate of how many people need to receive a receive an intervention (for example a drug, surgery, or exercise) before one person would experience a beneficial outcome because of the intervention. For example, if you need to give a stroke prevention drug to 20 people before one stroke is prevented, then the number needed to treat to benefit for that stroke prevention drug is 20. Ideally this number should be as small as possible.


Selena Ryan-Vig

About Selena Ryan-Vig

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Selena Ryan-Vig is the Communications and Engagement Officer at Cochrane UK. Her role primarily entails disseminating Cochrane evidence in accessible ways, managing Cochrane UK's website and social media accounts, and producing newsletters and infographics. With a colleague, Selena delivers interactive sessions to students from Years 10 to 13 to teach about evidence-based practice and to encourage critical thinking, particularly around healthcare claims made in the media. She also co-delivers talks for students to raise awareness of Cochrane and reliable, evidence-based resources. She has a psychology degree from the University of Bath. During her degree, she spent a placement year working in a national charity which provides support for young women affected by self-injury and training for professionals working with individuals who self-injure.