Absolute Risk Increase

The negative effect of treatment

The absolute risk reduction (ARI) is the absolute difference between the control event rate (CER) and the experimental event rate (EER). The absolute risk increase is essentially the negative impact of a treatment strategy in a given population. Absolute risk increase further informs upon the number needed to harm (NNH) calculation.
Absolute risk increase (ARI) is the absolute difference between the experimental event rate and the control event rate. ARI is used to calculate number needed to harm (NNH).
Absolute Risk Increase (ARI)
Click on the Number Needed to Harm button to continue.
Number Needed to Harm
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