In their excellent article, Hodgson et al state, ‘By convention, the NNT and NNH are always rounded up to the nearest whole figure’ (Reference Hodgson, Cookson and TaylorHodgson 2011). A more cautious convention is to round the number needed to treat (NNT) up, to avoid overstating the effectiveness, and to round the number needed to harm (NNH) down, to avoid understating the harms (BMJ 2011).
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