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Close mobile search navigation Article Navigation. Volume Article Contents Abstract. Relative risk versus absolute risk: one cannot be interpreted without the other.
Marlies Noordzij , Marlies Noordzij. Oxford Academic. Merel van Diepen. Fergus C. Kitty J. Select Format Select format. Permissions Icon Permissions. Abstract For the presentation of risk, both relative and absolute measures can be used. Outcome of interest. Person time. Incidence rate:. Relative measure of the effect:. Absolute measure of the effect:. Open in new tab. In Figures 1 and 2 , it is illustrated how two completely different scenarios with different background risks can lead to the same relative risk.
We present a hypothetical study including subjects: 60 in the group exposed to an environmental factor and 60 in the unexposed group. At the end of the follow-up period of 2 years the occurrence of the outcome of interest is measured in both groups. In Figure 1 , we see the situation in which the outcome of interest is rare. These risks resulted in a relative risk of 1. In Figure 2 , a similar study is presented that found exactly the same relative risk of 1.
These figures clearly show why reporting only the relative risk gives incomplete information. Open in new tab Download slide.
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