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“The name ‘number needed to treat’ is unfortunate, as it encourages people to think it is a precise number, without probabilistic content, which does not have to be referred to a baseline risk. In contrast, ‘absolute risk reduction’ (ARR) explicitly mentions both the probabilistic element and the comparative element that are inherent in the estimator. Given the regularity with which clinicians state that they find statistical concepts difficult, it is as well to have names that keep the basis for judgment explicit. It is strongly preferable to base both statistical inference and scientific conclusions on reliable statistics such as odds ratios and ARR, respectively.”

(Hutton JL Pharm Med 2010; 24:149)

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