Inventory of Depression and Anxiety Symptoms (IDAS)
Author of Tool:
Watson, D., O’ Hara, M. W., Simms, L. J., Kotov, R., Chmielewski, M., McDade-Montez, E. A., … & Stuart, S. (2007). Development and validation of the inventory of depression and anxiety symptoms. Psychological Assessment, 19, 253-268.
Primary use / Purpose:
The IDAS is a 99-item (expanded version) questionnaire that measures symptoms of major depression and related anxiety disorders.
The IDAS comprises 10 specific symptom scales: Suicidality, Lassitude, Insomnia, Appetite Loss, Appetite Gain, Ill Temper, Well-Being, Panic, Social Anxiety, and Traumatic Intrusions. It also consists of two broader scales: General Depression (which contains items overlapping with several other IDAS scales) and Dysphoria (which does not).
Robust psychometric validity has been demonstrated (Watson et al., 2007).