(compare with relative risk) The observed or calculated risk (rate) of an event in a defined population over a specified time period.

and its reduction This is the percentage of subjects in any group or sub-group that experiences a discrete bad outcome such as death or admission to the hospital. An efficacious therapy serves to reduce that risk. For example, if 15% of the placebo group died and 10% of the treatment group died, the absolute reduction in the risk of death is 5%.

the proportion of a population expected to get a disease over a specified time period. See also risk, relative risk.

The chance of a specific occurrence happening over a specified time-period.

The difference between going concern value and liquidation value at the valuation date.