An Assessment of the Screening Performance of a Single-Item Measure of Depression From the Edmonton Symptom Assessment Scale Among Chronically Ill Hospitalized Patients  Steven Z. Pantilat, MD, David L. O’Riordan, PhD, Suzanne L. Dibble, DNSc, RN, C. Seth Landefeld, MD  Journal of Pain and Symptom Management  Volume 43, Issue 5, Pages 866-873 (May 2012) DOI: 10.1016/j.jpainsymman.2011.05.022 Copyright © 2012 U.S. Cancer Pain Relief Committee Terms and Conditions

Fig. 1 A 2×2 table demonstrating the calculation of sensitivity (a/[a+c]), specificity (d/[b+d]), PPV (a/[a+b]), and NPV (d/[c+d]). Journal of Pain and Symptom Management 2012 43, 866-873DOI: (10.1016/j.jpainsymman.2011.05.022) Copyright © 2012 U.S. Cancer Pain Relief Committee Terms and Conditions