What is the range of values for attributable risk? What do the extreme values indicate?
What will be an ideal response?
The range for attributable risk is from one to minus one. An attributable risk of the extreme value of one indicates that all of the excess risk (above the level of Group 2) of the outcome measured by the rates is due to the unique characteristics of the Group 1 (group on the left side of the subtraction sign). This also means that if the unique characteristics of Group 1 were removed, then all of the excess risk would be eliminated, or in other words, the rate would be reduced to the level seen in Group 2. An attributable risk of the other extreme value of minus one indicates a protective effect of the unique characteristics of Group 1. This means that all the decreased risk (below the level of Group 2) of the outcome measured by the rates is due to unique characteristics of Group 1. This also means that if the unique characteristics of Group 1 were removed, then the rates in Group 1 would rise to the level of the rates in Group 2.
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