Factor Structure of the Inventory of Depressive Symptomatology, self-reported version (IDS-30-SR) Questionnaire on a Slovenian Sample

Abstract

Depression is a multifaceted psychiatric disorder that can be characterized by various symptom
dimensions. Considering the prevalence and societal burden of depression, it is essential that validated
instruments for diagnosis are used. In Slovenian cultural environment, only a few psychological questionnaires
have been validated. Furthermore, existing questionnaires do not differentiate between
different dimensions of depression. The Inventory of Depressive Symptomatology (IDS-30) is a commonly
used questionnaire for screening depression that accounts for all symptom dimensions specified by
the Diagnostic and Statistical Manual of Mental Disorders. The self-report version of IDS-30 has previously
been used in Slovenia, demonstrating its convergent validity. However, to date, its structural
validity has not been tested. The present study investigates the factor structure of IDS-30. We replicated
the three-factor structure consisting of mood/cognition, anxiety/somatics, and sleep disturbances
that is widely reported in the literature. These dimensions of depression are supported
by the neurobiological literature.