
Psychosomatics 47:392-398, October 2006
doi: 10.1176/appi.psy.47.5.392
© 2006 Academy of Psychosomatic Medicine
Somatic Complaints in Primary Care: Further Examining the Validity of the Patient Health Questionnaire (PHQ-15)
Alejandro Interian, Ph.D.,
Lesley A. Allen, PH.D.,
Michael A. Gara, PH.D.,
Javier I. Escobar, M.D., and
Angélica M. Díaz-Martínez, Psy.D.
Received May 4, 2005; revised September 28, 2005; accepted October 13, 2005. From the UMDNJ-Robert Wood Johnson Medical School, Dept. of Psychiatry. Address correspondence and reprint requests to Dr. Interian, Dept. of Psychiatry, UMDNJ-Robert Wood Johnson Medical School, 671 Hoes Lane D306, Piscataway, NJ 08854-5635. e-mail: interial{at}umdnj.edu
The authors examined the reliability and validity of the PHQ-15, a measure of current somatic complaints. An index of medically unexplained symptoms was used as a key criterion. Data were utilized from medical outpatients enrolled in a treatment study for moderate-to-severe somatization (N=172). Approximately 68% of the sample was Hispanic. Results showed that the PHQ-15 was moderately related to a history of medically unexplained symptoms among non-Hispanic participants. Results indicated ethnic differences on the validity profile of the PHQ-15 showing that the criterion variables were less predictive of the PHQ-15 among Hispanics than among non-Hispanics. Also, among the Hispanic group, the PHQ-15 was less related to medically unexplained symptoms and more to psychiatric distress. General support was provided for using the PHQ-15 with clinical samples composed of non-Hispanics. Also, the PHQ-15 appears to measure medically unexplained symptoms, psychiatric distress, and physical functioning. Further study is recommended to better evaluate ethnic variations and other types of validity for the PHQ-15.
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