Glossary

Most important terms related with Health Technology Assessment.

ARI, absolute risk increase

 

the absolute arithmetic difference between the risk of an negative endpoint in the control group and the risk in the experimental group. ARI determines how much the risk of an adverse endpoint increased as a result of the intervention.

ARR, absolute risk reduction

 

the absolute arithmetic difference between the risk of an adverse endpoint in the control group and this risk in the experimental group. ARR determines the absolute value of risk reduction. The greater the ARR, the greater the intervention’s impact. In case two interventions have identical impact, ARR is zero.