The purposes of this study were to develop a questionnaire to measure cognitive contents which cause depression and anxiety, and to construct a cognitive-behavioral model of depression and anxiety which can explain the correlation between depression and anxiety from contents of cognition. After the selection of items to measure contents of cognition and factor analysis of these items, scale development resulted in the development of a Depression and Anxiety Cognition Scale (DACS) which has 5 subscales, including 10 items for each factor: negative view of the future, prediction of threatening and disgusting situations, negative evaluation of self, negative evaluation of the past and the present, and degree of threat and disgust of specific situations. By covariance structure analysis using the DACS and Depression and Anxiety Mood Scale, it was revealed that a depressive mood was caused by a 'negative view of the future' which was caused by a 'negative evaluation of the past and the present' and a 'negative evaluation of self; and that an anxious mood was caused by a depressive mood and 'prediction of threatening and disgusting situations' which was caused by a 'negative evaluation of the past and the present' and a 'degree of threat and disgust of specific situations'. Based upon these findings, a new cognitive-behavioral model of depression and anxiety was constructed which can explain the correlation between depression and anxiety through common cognitive content of 'negative evaluation of the past and the present'.
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