We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleThe number needed to treat: a clinically useful measure of treatment effectAuthorsCook, R. J; Sackett, D. LPublicationBMJ, 1995, Vol 310, Issue 6977, p452ISSN0959-8138Publication typearticleDOI10.1136/bmj.310.6977.452