The Beck Depression Inventory and General Health Questionnaire as measures of depression in the general population: a validation study using the Composite International Diagnostic Interview as the gold standard

The Beck Depression Inventory (BDI) and the General Health Questionnaire (GHQ) are commonly used in population studies as measures of depression. We examined in a population sample the validity of four scales for depressive symptoms, the GHQ-12, the 21- and 13-item versions of the BDI, and a new 6-item version of the BDI developed for this study. A total of 5561 participants in the "Health 2000" survey (30-79 years) completed the four scales and were assessed with the Composite International Diagnostic Interview (CIDI), which was used as the validation criterion. We selected items for the BDI-6 through an exploratory factor analysis for the BDI-21. The accuracy of the scales, including the BDI-6, was satisfactory (c-statistics 0.88-0.92 for depression within the past 2 weeks and 0.80-0.83 within the past 12 months) and slightly better for men (0.92-0.96 and 0.85-0.87) than for women (0.86-0.88 and 0.78-0.79). Higher scores in all the scales were associated with more severe depression and more recent depressive episodes. This study suggests that various versions of the BDI and the GHQ-12 are useful in detecting depressive disorders in the general population. Even the 6-item version of the BDI showed acceptable criterion validity, although replication in an independent dataset is needed to confirm its validity.