Beck Depression Inventory-II (BDI-II) Beck Depression Inventory-II Sufficient yes Multiple countries and cultural groups NCIT:C40438 Beck Depression Inventory Self 13 years and older BDI-II SCDO:0000103 The BDI-II is the most widely used instrument for measuring depression. It consists of 21 items to assess the intensity of depression in clinical and normal patients. Each item is a list of four statements arranged in increasing severity about a particular symptom of depression, and rated on a scale of 0 to 3. Beck A.T., Ward C. H., Mendelson M., Mock J., & Erbaugh J. (1961) An inventory for measuring depression. Archives of General Psychiatry, 4, 561-571. Spanish Clinic Patients Quality of Life Measure Quality of Life and Care Diagnostic Instrument