11/30/2023 0 Comments Free spss 16.0The equations and approach are identical to those described above, except that NNH will have a negative absolute risk reduction (which is ignored when expressing NNH). When an experimental treatment is detrimental, the term 'number needed to harm' (NNH) is often used. \\ ARR = (Control\ event\ rate) - (Experimental\ event\ rate)
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