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→Attributable fraction (AF)
The '''attributable fraction''' is the proportion of disease in exposed individuals that is due to the exposure, alternatively, it is the proportion of cases that could have been prevented if exposure had been avoided. It is calculated by dividing the risk difference by the risk of disease in the exposed group, or directly from the risk ratio.</big>
The '''attributable fraction''' is the proportion of disease in exposed individuals that is due to the exposure, alternatively, it is the proportion of cases that could have been prevented if exposure had been avoided. It is calculated by dividing the risk difference by the risk of disease in the exposed group, or directly from the risk ratio.</big>
[[File:AF.jpg]]
[[File:AF.jpg]]