The Beck II Depression Inventory (BDI-II) is a popular and reliable scale that assesses depressive symptoms. It asks questions ranging from changes in appetite and feelings of sadness to difficulty concentrating and loss of interest in activities. It is a self-report instrument and may be administered verbally or written. The BDI-II has shown high internal consistency and good concurrent validity in a variety of samples including clinical psychiatric and nonclinical samples. It also has been used in several studies to evaluate treatment outcomes and is available in various languages including Spanish.

Beck II Depression Inventory has been studied extensively using IRT (Item Response Theory) analysis and is known to have a two-factor structure with subscales measuring different aspects of depressive symptoms. This structure is consistent with the original intent of Beck et al. (Citation1996) to identify a general factor and specific factors that measure the intensity of depressive symptoms in clinical outpatients. BDI-II total scores have been found to correlate well with PHQ-9 and CES-D total scores, indicating good convergent validity.

Becks Depression Inventory II: A Tool for Assessing Mood Disorders

MI analysis of BDI-II scores shows that the general factor explains about 88% of the variance in the symptom items, suggesting that the overall score provides an adequate summary of depression symptoms. However, the BDI-II does not appear to be invariant by gender (Whisman, Judd, Whiteford, & Gelhorn, Citation2012; Wu, Citation2010). The results of these analyses support the use of the BDI-II as a tool for assessing depressive severity and should be considered when selecting a cut-off point for depression diagnosis.