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Number needed to treat

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Number needed to treat diagram
calc
Standard equations are used to calculate NNT and other probabilities from the rsults of a medical study.
Experimental group size:
Control group size:
Events in experimental group:
Events in control group:

EER
CER
ARR
RRR
NNT
OR/RR
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notes
The NNT analysis find how many patients need to be treated in order to prevent one event happening. The same analysis can be made for side effects, resulting in a NNH (Number Needed to Harm).
Fill in the blue boxes with the results of a controled study, and the results of various statistical analyses are given in the orange output boxes.