title: Development and validation of the Inventory of Depression and Anxiety Symptoms (IDAS).
abstract: 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, Ill 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 interview-based measures of depression and anxiety.
authors.affiliation: Department of Psychology, University of Iowa, Iowa City, IA 52242-1407, USA. david-watson@uiowa.edu
authors.forename: David
authors.initials: D
authors.lastname: Watson
authors.forename: Michael W
authors.initials: MW
authors.lastname: O'Hara
authors.forename: Leonard J
authors.initials: LJ
authors.lastname: Simms
authors.forename: Roman
authors.initials: R
authors.lastname: Kotov
authors.forename: Michael
authors.initials: M
authors.lastname: Chmielewski
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: McDade-Montez
authors.forename: Wakiza
authors.initials: W
authors.lastname: Gamez
authors.forename: Scott
authors.initials: S
authors.lastname: Stuart
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001007:Anxiety / Q000175:diagnosis* / Q000523:psychology; D003863:Depression / Q000175:diagnosis* / Q000523:psychology; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires