We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleData dredging, bias, or confoundingAuthorsDavey Smith, G.PublicationBMJ, 2002, Vol 325, Issue 7378, p1437ISSN0959-8138Publication typearticleDOI10.1136/bmj.325.7378.1437