There is a calculator for this in Epi Info (available free from CDC) - it is in 'utilities' called 'stat-calc' in the version I have (3.3.2) David Braunholtz [log in to unmask] Tel: (01224) 554195 Senior Statistician IMMPACT Project University of Aberdeen 2nd Floor, Foresterhill Lea House Foresterhill Campus Westburn Road Aberdeen AB25 2ZY Scotland Fax: ++ 44 1224 553708 Web: www.abdn.ac.uk/immpact/ -----Original Message----- From: Evidence based health (EBH) [mailto:[log in to unmask]] On Behalf Of Olive Goddard Sent: 14 December 2005 09:21 To: [log in to unmask] Subject: Re: Calculator for OR and 95% CI thereof Dear Colleagues, Can anyone help Martin. Thanks, Olive Olive Goddard Centre and Editorial Manager Centre for Evidence-Based Medicine Room 116 Institute of Health Sciences Old Road Campus, Headington Oxford, OX3 7LF ..................................................................... Tel: +44 (0)1865 226991 email: [log in to unmask] Fax: +44 (0)1865 226845 web: www.cebm.net Mobile: 0773 484 2403 web: www.cebmh.com >>> "Martin Burton" <[log in to unmask]> 12/13/05 2:50 pm >>> Olive Do you know where I can find a simple calculator of OR and their 95% CI? Catmaker doesn't return (OR and certainly not the CI of it) when comparing alternative therapies or therapy and control and looking at dichotomous outcomes. Thanks Martin Martin J Burton MA DM FRCS Consultant Otolaryngologist Senior Clinical Lecturer, University of Oxford Co-ordinating Editor, Cochrane Ear, Nose & Throat Disorders Group Department of Otolaryngology - Head & Neck Surgery The Radcliffe Infirmary Oxford OX2 6HE Tel: +44 (0)1865 224168 Fax: +44 (0)1865 224332