Interpretation

In the example we have used, the NNT was calculated as a whole value, but this is rarely the case. Suppose that in our previous example the experimental event rate had been 60%. The NNT would then be 3.3. In all cases the NNT is rounded up, so in this case it would be 4.

In a perfect world an intervention would have an NNT of 1, meaning that everyone would experience the benefit of the drug. Unfortunately, an NNT of 1 is very rare, but the smaller the NNT, the better the intervention.

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