Risk-Benefit Prediction Model – Same as a Risk Prediction Model except factors that predict benefit of a specific treatment and those that predict harm from the treatment are also included. |
Control Event Rate (CER) – Rate of bad outcomes in the control group.46 |
Pre-treatment risk – Risk of bad outcomes in the absence of treatment. In a clinical trial, pre-treatment risk is equivalent to the true control event rate (CER). |
Experimental Event Rate (EER) – Rate of bad outcomes in the intervention group. 46 |
Relative Risk Reduction (RRR) – The proportional reduction in the rate of bad events between experiment (experimental event rate [EER]) and control (control event rate [CER]) patients in a trial, calculated as |EER – CER|/CER. 46 |
Absolute Risk Reduction (ARR) – The absolute arithmetic difference in event rates, |EER – CER|. 46 |
Number Needed to Treat (NNT) – The number of patients who need to be treated to prevent 1 additional bad outcome; calculated as 1/ARR. |