Prevented fraction, Advanced Statistics

Prevented fraction is a measure which can be used to attribute the protection against the disease directly to an intervention. The measure can given by the proportion of disease which would have occurred had the intervention not been present in population  which can be given as follows

1336_prevented fraction.png 

here PAI is the risk of the disease in absence of the intervention in the population and PI is the overall risk in the presence of the intervention.

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