Receiver operating characteristic (ROC) curves and the definition of threshold levels to diagnose coronary artery disease on electrocardiographic stress testing. Part II: The use of ROC curves in the choice of electrocardiographic stress test markers of ischaemiaMarazìa, Stefania; Barnabei, Luca; De Caterina, RaffaeleJournal of Cardiovascular Medicine: January 2008 - Volume 9 - Issue 1 - p 22–31 doi: 10.2459/JCM.0b013e32813ef418 Original articles Abstract Author Information A common problem in diagnostic medicine, when performing a diagnostic test, is to obtain an accurate discrimination between ‘normal’ cases and cases with disease, owing to the overlapping distributions of these populations. In clinical practice, it is exceedingly rare that a chosen cut point will achieve perfect discrimination between normal cases and those with disease, and one has to select the best compromise between sensitivity and specificity by comparing the diagnostic performance of different tests or diagnostic criteria available. Receiver operating characteristic (or receiver operator characteristic, ROC) curves allow systematic and intuitively appealing descriptions of the diagnostic performance of a test and a comparison of the performance of different tests or diagnostic criteria. This review will analyse the basic principles underlying ROC curves and their specific application to the choice of optimal parameters on exercise electrocardiographic stress testing. Part II will be devoted to the comparative analysis of various parameters derived from exercise stress testing for the diagnosis of underlying coronary artery disease. Institute of Cardiology, ‘G. d'Annunzio’ University, Chieti, Italy Received 9 April, 2006 Revised 4 October, 2006 Accepted 24 October, 2006 Correspondence to Prof Raffaele De Caterina, Institute of Cardiology, ‘G. d'Annunzio’ University, c/o Ospedale San Camillo de Lellis, Via Forlanini 50, 66100 Chieti, Italy Tel: +39 0871 41512; fax: +39 0871 402817; e-mail: firstname.lastname@example.org © 2008 Italian Federation of Cardiology. All rights reserved.