Beck Depression Inventory
BDI-II

One measure of an instrument's usefulness is to see how closely it agrees with another similar instrument that has been validated against information from a clinical interview by a trained clinician. In this respect, the BDI-II is positively correlated with the Hamilton Depression Rating Scale with a Pearson r of 0.71, showing good convergent validity. The test was also shown to have a high one-week test–retest reliability (Pearson's r = 0.93), suggesting that it was not overly sensitive to day-to-day variations in mood. The test also has high internal consistency (α =.91).
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