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The percentage of instances of an illness that can be accounted for by a particular risk factor. For example, people exposed to asbestos have a certain risk of developing lung cancer, and if they also smoke tobacco, they are also at risk from that factor. These risks may be estimated from cohort studies.Synonym: additional risk; attributable risk
See also: fraction
size expressed as a relative part of a unit.
the proportion of disease in the exposed group which is caused by the factor.