The purpose of the present study was to develop and evaluate a self-report Anxious Depression Scale (ADS). The Anxious Depression Scale assesses symptoms of anxious depression, which is a depressive condition comorbid with anxiety disorders. The participants, 114 outpatients having any anxiety disorder with depression, 153 outpatients having any anxiety disorder without depression, 80 outpatients with major depression, and 97 undergraduate students, completed the Anxious Depression Scale and other clinical scales relating to depression and anxiety. Exploratory factor analysis revealed that the Anxious Depression Scale, including 20 items, appropriately fell into 4 factors: "behavioral/emotional symptoms," "physical symptoms," "aggressive emotions (dynamic emotions) ," and "non-aggressive emotions (static emotions)." Internal consistency of the scale and each subscale was sufficiently high (α=0.74-0.87). The results of an analysis of variance showed that the patients with anxious depression had higher scores than the other participants on all subscales and also had a higher sum on the Anxious Depression Scale. Furthermore, the Anxious Depression Scale scores correlated moderately with other self-report measures of depression. The Anxious Depression Scale is able to measure specifically the severity of anxious depression. Differences in depressive symptoms of each type of anxious disorder were discussed.
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