We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleCalculating the number needed to treat for trials where the outcome is time to an eventAuthorsAltman, D. G; Andersen, P. K.PublicationBMJ, 1999, Vol 319, Issue 7223, p1492ISSN0959-8138Publication typearticleDOI10.1136/bmj.319.7223.1492