Development and Validation of the Inventory of Depression and Anxiety Symptoms II – German Version
The Expanded Version of the Inventory of Depression and Anxiety Symptoms (IDAS-II) is a 99-item self-report measure containing 18 nonoverlapping dimensional scales assessing symptoms of depression, anxiety, and mania. The aim of this study was to develop and validate a German adaptation of the IDAS-II. Participants from a community sample (N = 1054) completed the IDAS-II (German version) and a series of additional measures of depression and anxiety disorders. Item-level confirmatory factor analyses (CFA) confirmed unidimensionality and indicated good internal consistency of most symptom scales. A CFA of the IDAS-II scales based on exploratory results by Watson et al (2012) confirmed a three factor model of Distress, Obsessions/Fear, and Positive Mood. Correlational analyses with additional symptom measures supported convergent and discriminant validity. The IDAS-II (German Version) allows for a reliable assessment of severity of depression, anxiety, and bipolar symptoms, and is one of the first clinical measures for German-speaking samples that is consistent with the Hierarchical Taxonomy Of Psychopathology (HiTOP).