Beck Depression Inventory-Second Edition [1]
The BDI-II is a widely used 21-item self-report inventory measuring the severity of depression in adolescents and adults. The BDI-II was revised in 1996 to be more consistent with DSMIV criteria for depression. For example, individuals are asked to respond to each question based on a two-week time period rather than the one-week timeframe on the BDI. The BDI-II is widely used as an indicator of the severity of depression, but not as a diagnostic tool, and numerous studies provide evidence for its reliability and validity across different populations and cultural groups. It has also been used in numerous treatment outcome studies and in numerous studies with trauma-exposed individuals.