We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleConfounding and Simpson's paradox.AuthorsJulious, S A; Mullee, M APublicationBMJ (Clinical research ed.), 1994, Vol 309, Issue 6967, p1480ISSN0959-8138Publication typeJournal ArticleDOI10.1136/bmj.309.6967.1480