Limitations
Though the BAI was developed to minimize its overlap with the depression scale as measured by the Beck Depression Inventory, a correlation of r=.66 (p<.01) between the BAI and BDI-II was seen among psychiatric outpatients, suggesting that the BAI and the BDI-II equally discriminate between anxiety and depression.
Another study indicates that, in primary care patients with different anxiety disorders including social phobia, panic disorder, panic disorder with or without agoraphobia, agoraphobia, or generalized anxiety disorder, the BAI seemed to measure the severity of depression. This suggests that perhaps the BAI cannot adequately differentiate between depression and anxiety in a primary care population.
In a study examining the BAI's use on older adults with generalized anxiety disorder, no discriminant validity was seen between the BAI and measures of depression. This could perhaps be due to the increased difficulty in discriminating between anxiety and depression in older adults due to "de-differentiation" of the symptoms of anxiety with the aging process, as hypothesized by Krasucki et al.
Finally, the mean and median reliability estimates of the BAI tend to be lower when given to a nonpsychiatric population, such as college students, than when given to a psychiatric population.
Read more about this topic: Beck Anxiety Inventory
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