Absolute Risk Increase (ARI) Quiz

ARI is the absolute risk of adverse events in the exposed or treatment group (ART) minus the absolute risk of events in the control group (ARC): ARI = ART–ARC. Same as risk difference. Also, the proportion of treated persons who experience an adverse event minus the proportion of untreated persons who experience the event.

ARI is calculated by subtracting the absolute risk of events in the control group (ARC) from the absolute risk of adverse events in the exposed or treatment group (ART): ARI = ART–ARC.

Another name for ARI is risk difference.