We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleNumbers needed to treat derived from meta-analyses---sometimes informative, usually misleadingAuthorsSmeeth, L.; Haines, A.; Ebrahim, S.PublicationBMJ, 1999, Vol 318, Issue 7197, p1548ISSN0959-8138Publication typearticleDOI10.1136/bmj.318.7197.1548