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Factor Analysis of The Colombian Translation of The Delirium Rating Scale (DRS), Revised–98

Received April 30, 2007; revised July 23, 2007; accepted August 1, 2007. From Universidad Pontificia Bolivariana, Faculty of Medicine, Research Group in Liaison Psychiatry, Clínica Universitaria Bolivariana, Medellín, Colombia; Lilly Research Laboratories, Indianapolis, IN, U.S.A.; University of Mississippi Medical School, Jackson, MS, U.S.A., Tufts University School of Medicine, Boston, MA, U.S.A., and Indiana University School of Medicine, Indianapolis, IN, U.S.A. Send correspondence and reprint requests to José G. Franco, M.D., Faculty of Medicine, Universidad Pontificia Bolivariana, Research Group in Liaison Psychiatry, Clínica Universitaria Bolivariana, Medellín, Colombia. e-mail: josefranco{at}une.net.co
© 2009 The Academy of Psychosomatic Medicine

BACKGROUND: The phenomenology of delirium needs further elucidation using validated tools. OBJECTIVE: The authors sought to derive valid factors from the Delirium Rating Scale (DRS), Revised –98. METHOD: A factor analysis of the DRS-R–98 was performed among 161 medical-surgical patients. RESULTS: Scores ranged from 0 to 7 in 120 patients (74.53%; no delirium), 8 to 13 in 19 (11.80%; subclinical/prodromal delirium), and 14 in 22 (13.66%; delirium). The DSM-IV–TR delirium incidence was 19.87%. The first two rotated factors explained 63.37% of the variance and may correspond to Cognition and Psychosis/Agitation factors. The dimension of motor retardation loaded with cognitive items. Motor agitation and retardation clustered with inattention, which is the cardinal symptom of delirium. CONCLUSION: The DRS-R–98 has good construct validity in this Latino population.

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