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Psychiatry Res ; 199(3): 169-73, 2012 Oct 30.
Article in English | MEDLINE | ID: mdl-22698261

ABSTRACT

Little research has examined the underlying symptom structure of major depressive disorder (MDD) symptoms based on DSM-IV criteria. Our aim was to analyze the symptom structure of major depression, using the Patient Health Questionnaire-9 (PHQ-9). The PHQ-9 was administered to a sample of 2615 Army National Guard soldiers from Ohio. A one-factor model of depression and three separate two-factor models previously established in the literature were evaluated using confirmatory factor analysis. Results demonstrated greater support for the two-factor models of depression than for the one-factor model. The best fitting model was the two-factor model of somatic and non-somatic symptoms supported previously by Krause et al. (2010) and Richardson and Richards (2008). Implications for understanding the components and mechanisms of MDD are discussed.


Subject(s)
Depressive Disorder, Major/diagnosis , Models, Psychological , Adolescent , Adult , Factor Analysis, Statistical , Female , Humans , Interviews as Topic , Male , Middle Aged , Ohio , Psychiatric Status Rating Scales , Psychometrics , Severity of Illness Index , Surveys and Questionnaires , Veterans/psychology
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