Number needed to harm: Difference between revisions

Revision as of 13:44, 17 April 2017

Revision as of 13:45, 17 April 2017

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In the context of the example the number needed to harm can be introduced as the estimate of the number of patients needed to observe for one year to detect one patient affected by exposure:

<math>N_{\text{NNH}}\cdot ( \gamma_{+} - \gamma_{-}) = 1 </math>

NNH therefore is expressed as the inverse of [[attributable risk]] per patient per year:

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This means that if 417 individuals are exposed to the risk factor for one year, 1 will develop the disease that he of she would not have otherwise.

==Number of exposures needed to harm==