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Dear Colleagues, If anyone has the answer to Peter's query I should be grateful if they would reply to him directly. All good wishes, Olive Olive Goddard Centre and Editorial Manager Centre for Evidence-Based Medicine Department of Primary Health Care Old Road Campus, Headington Oxford, OX3 7LF ..................................................................... Tel: +44 (0)1865 289337 email: [log in to unmask] Fax: +44 (0)1865 289336 web: www.cebm.net Mobile: 07804 625002 web: www.cebmh.com ( http://www.cebmh.com ) >>> "Verhagen, P.J." <[log in to unmask]> 20/09/2007 21:04 >>> Dear reader, I have the following question. I teach our residents on EBM (I attended one of your courses in 2003). I would like to know more about the background, history of the 2x2 table. Could you help me with that? It is not easy to find something. So I would appreciate your help very much. Many thanks, Peter J. Verhagen, psychiatrist