Psychosomatics 41:121-127, April 2000
© 2000 The Academy of Psychosomatic Medicine
Factor Analysis of the Zung Self-Rating Depression Scale in a Large Ambulatory Oncology Sample
Steven D. Passik, Ph.D.,
Jeremy C. Lundberg, M.S.W., L.S.W.,
Barry Rosenfeld, Ph.D.,
Kenneth L. Kirsh, M.S.,
Kathleen Donaghy, Ph.D.,
Dale Theobald, M.D., Ph.D.,
Elizabeth Lundberg, B.A., and
William Dugan, M.D.
Received April 15, 1999; revised August 16, 1999; accepted September 7, 1999. From Oncology Symptom Control and Research, Community Cancer Care, Indianapolis, IN; Memorial Sloan-Kettering Cancer Center, New York, NY; Indiana University and Purdue University, Indianapolis; Indiana Oncology and Hematology Consultants, Community Cancer Care, Inc., Indianapolis, IN. Address correspondence and reprint requests to Dr. Passik, Community Cancer Care, Inc., Oncology Symptom Control Research, 115 W. 19th Street, Indianapolis, IN 46202.
Screening cancer patients for depression with self-report inventories presents clinical and methodological challenges. Many investigators separate "somatic" from "cognitive" symptoms when adapting such measures to oncology settings. However, this practice has rarely been empirically validated through factor-analytic studies. The following study describes a factor analysis of the Zung Self-Rating Depression Scale (ZSDS) from a large ambulatory sample of cancer patients (N=1,109). A four-factor solution emerged, consisting of a cognitive symptom factor, a manifest depressed mood factor, and two somatic factors (eating and non–eating related). These factors accounted for 20% (cognitive), 13% (mood), 8% (non-eating), and 7% (eating) of the variance on the Zung, respectively. The authors discuss the implications of these results as they pertain to screening cancer patients for depression.
Key Words: Depression • Zung Depression Scale • Cancer
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