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In epidemiology, attributable fraction for the population (AFp) is the proportion of incidents in the population that are attributable to the risk factor. The term attributable risk percent for the population is used if the fraction is expressed as a percentage. [ 1 ]
The adverse outcome (black) risk difference between the group exposed to the treatment (left) and the group unexposed to the treatment (right) is −0.25 (RD = −0.25, ARR = 0.25). The risk difference (RD), excess risk, or attributable risk [1] is the difference between the risk of an outcome
Frequently used measures of risk and benefit identified by Jerkel, Katz and Elmore, [4] describe measures of risk difference (attributable risk), rate difference (often expressed as the odds ratio or relative risk), population attributable risk (PAR), and the relative risk reduction, which can be recalculated into a measure of absolute benefit ...
In epidemiology, attributable fraction among the exposed (AF e) is the proportion of incidents in the exposed group that are attributable to the risk factor. The term attributable risk percent among the exposed is used if the fraction is expressed as a percentage. [ 1 ]
A risk score is a metric used in statistics, biostatistics, econometrics and related disciplines to stratify a population for targeted screening. It assigns scores to individuals based on risk factors; a higher score reflects higher risk.
relative risk (RR) values; data for population at risk; health data; percentage of solid fuels use. A minimum working knowledge of epidemiological concepts, in particular exposure–response relationship, relative risk, attributable risk and life table calculations is required to run the software. AirQ+ includes default values users can use for ...
It is defined as the inverse of the absolute risk increase, and computed as / (), where is the incidence in the treated (exposed) group, and is the incidence in the control (unexposed) group. [1] Intuitively, the lower the number needed to harm, the worse the risk factor, with 1 meaning that every exposed person is harmed.
It is calculated as = /, where is the incidence in the exposed group, is the incidence in the population. [ 1 ] [ 2 ] It is used when an exposure reduces the risk, as opposed to increasing it, in which case its symmetrical notion is attributable fraction for the population .