number needed to treat (nnt)

How is NNT Calculated?

NNT is calculated using the formula:
NNT = 1 / (Control Event Rate - Experimental Event Rate)
Where the Control Event Rate (CER) is the incidence of the outcome in the control group and the Experimental Event Rate (EER) is the incidence of the outcome in the treatment group. A lower NNT indicates a more effective intervention.

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