What Does “NNT” Mean and Why Should You Care?
Family Medicine Initiative
MAY 7, 2025
As you might have noticed, I often use the Number Needed to Treat (NNT) to communicate research results. While I strive to write evidence-based but easy-to-understand articles, I believe the NNT is a research concept every GP should know. What is the NNT? It’s the number of patients you need to treat to prevent one bad outcome. How to calculate it? 1 divided by the “absolute risk reduction” (= the risk in the control group minus the risk in the intervention group).
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