Development and validation of the Inventory of Depression and Anxiety Symptoms–II—German version.

Abstract

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 = 1,054) completed the IDAS-II (German version). In addition, part of the sample (N = 550) completed a series of additional measures of depression (Patient Health Questionnaire–9, WHO–Five Well-Being Index, Symptom Checklist–90 Revised—Short Version) and anxiety disorders (Generalized Anxiety Disorder Scale–7, Fear of Negative Evaluation Scale–5, Dimensional Obsessive–Compulsive Scale, The International Trauma Questionnaire). We conducted item-level confirmatory factor analyses (CFA) separately for the 15 nonsaturated IDAS-II scales, which confirmed unidimensionality. McDonald’s ω indicated good internal consistency (ω > .8) of all symptom scales except Euphoria (ω = .751) and Ordering (ω = .728). 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 the convergent and discriminant validity of the IDAS-II scales. The IDAS-II (German version) allows for a reliable assessment of the 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).

A Psychometric Evaluation of the Expanded Version of the Inventory of Depression and Anxiety Symptoms (IDAS-II) in Children and Adolescents

“…We also explored the overarching factor structure defined by the 18 symptom dimensions of the IDAS-II and similar results again emerged for youths and adults, which were also largely in line with previous adult evaluations (De la Rosa-Ca´ceres et al, 2020;Irak & Albayrak, 2020;Watson et al, 2012;Weitzner et al, 2020;Wester et al, 2022). Three highly similar factors emerged in both youth and adults (distress, positive mood, and OCD), and a fourth for youth (PTSD).…”

“…D. Nelson et al, 2015), but no psychometric evaluation of the scale has been conducted with youth. Adult evaluations support that the proposed 18-dimension model of the measure fits self-reported data well, that is, selfreported symptoms within the proposed dimensions cooccur in a way that is predicted by the model (De la Rosa-Ca´ceres et al, 2020;Irak & Albayrak, 2020;Weitzner et al, 2020;Wester et al, 2022). The IDAS-II scales have shown good internal consistency (most estimates above a Cronbach's alpha of .80) (De la Rosa-Ca´ceres et al, 2020;Weitzner et al, 2020) and temporal stability (with most test-retest correlations being above .70) (De la Rosa-Ca´ceres et al, 2020;Irak & Albayrak, 2020;Watson et al, 2012;Weitzner et al, 2020).…”

“…Furthermore, scores on the euphoria scale have been found to be higher in non-clinical than in clinical samples, raising some concerns about the complex relationship between euphoria and BD (Watson et al, 2012). Finally, an overarching three-factor structure (distress, obsessions/fear, and positive mood) has largely been supported (De la Rosa-Ca´ceres et al, 2020;Irak & Albayrak, 2020;Weitzner et al, 2020;Wester et al, 2022).…”

Treatment credibility as a mechanism of change in cognitive behavioral therapy: Effects on depression and anxiety.

“…These symptoms could be differentially related to TC (for a critical discussion of combining different symptoms to sum scores, see Fried & Nesse, 2015; McNeish & Wolf, 2020). To gain a better understanding of which symptoms influence TC, future studies might use instruments that reliably differentiate specific symptoms of depression and anxiety (e.g., the Inventory of Depression and Anxiety Symptoms-II, Wester et al, 2022). Consequently, we deem it imperative to carry out additional studies to gain a more precise picture of the intraindividual interplay of TC and different symptoms.…”

“…This article is intended solely for the personal use of the individual user and is not to be disseminated broadly. Wester et al, 2022). Consequently, we deem it imperative to carry out additional studies to gain a more precise picture of the intraindividual interplay of TC and different symptoms.…”