Journal
PSYCHOLOGICAL ASSESSMENT
Volume 19, Issue 3, Pages 253-268Publisher
AMER PSYCHOLOGICAL ASSOC
DOI: 10.1037/1040-3590.19.3.253
Keywords
major depression; anxiety disorders; scale development; factor analysis
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The authors describe a new self-report instrument, the Inventory of Depression and Anxiety Symptoms (IDAS). which was designed to assess specific symptom dimensions of major depression and related anxiety disorders. They created the IDAS by conducting principal factor analyses in 3 large samples (college students, psychiatric patients, community adults); the authors also examined the robustness of its psychometric properties in 5 additional samples (high school students, college students, young adults, postpartum women, psychiatric patients) who were not involved in the scale development process. The IDAS contains 10 specific symptom scales: Suicidality, Lassitude, Insomnia, Appetite Loss, Appetite Gain, III Temper, Well-Being, Panic, Social Anxiety, and Traumatic Intrusions. It also includes 2 broader scales: General Depression (which contains items overlapping with several other IDAS scales) and Dysphoria (which does not). The scales (a) are internally consistent, (b) capture the target dimensions well, and (c) define a single underlying factor. They show strong short-term stability and display excellent convergent validity and good discriminant validity in relation to other self-report and interviewbased measures of depression and anxiety.
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