Absolute benefit increase (ABI)
Absolute Benefit Increase (ABI)
- this measure is used when the treatment is likely to increase the number of beneficial events
- calculated as EER-CER (expressed as a percentage)
Relative Benefit Increase (RBI)
- ABI/CER
Key:
- Experimental Event Rate (EER) - This is the event rate in the group given active treatment - this is expressed as a percentage. It is calculated as the number of events number by the number of patients receiving active treatment
- Control Event Rate (CER) - This is the event rate in the group given active placebo - this is expressed as a percentage. It is calculated as the number of events number by the number of patients receiving placebo.
Reference:
- Doctor (March 22nd 2005). Ready Reckoner.
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