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===Risk difference=== (RD)<br />
===Risk difference (RD) ===
'''Risk difference''' or '''Attributable risk''' is the amount of disease observed in the population which is attributable to the exposure of interest and is calculated by subtracting the risk of disease in the unexposed group from the risk of disease in the exposed group. It assumes that the risk of disease in the non-exposed group is the ‘baseline’ risk of disease, therefore in order to calculate a risk difference groups of animals must be similar with regards to all other factors associated with disease.</big>
'''Risk difference''' or '''Attributable risk''' is the amount of disease observed in the population which is attributable to the exposure of interest and is calculated by subtracting the risk of disease in the unexposed group from the risk of disease in the exposed group. It assumes that the risk of disease in the non-exposed group is the ‘baseline’ risk of disease, therefore in order to calculate a risk difference groups of animals must be similar with regards to all other factors associated with disease.</big>