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Objective: Self-efficacy can be conceptualised as a person’s perception of their own ability to produce a desired outcome. Low self-efficacy has been reported to be a mediating variable in developing depression. The Self-Efficacy Questionnaire for Depressed Adolescents (SEQ-DA) is a 12-item inventory, designed to measure self-perceived ability of the young person to cope with depressive symptoms. This paper presents further information on the psychometric properties of the SEQ-DA in a clinical sample of depressed adolescents.Method: The SEQ-DA was administered to a clinical sample of 130 adolescents with a depressive disorder at baseline, at the end of 3 months of therapy and 6 months following therapy. A diagnosis of depression was made using the Schedule for Affective Disorders and Schizophrenia for School Aged Children. The ability of the SEQ-DA to identify those adolescents who had a diagnosis of major depressive disorder at baseline, following treatment and at 6-month follow-up was evaluated. Receiver operating characteristic (ROC) analysis of the SEQ-DA in this clinical sample of depressed adolescents was undertaken to establish cut-off scores of the SEQ-DA.Results: The SEQ-DA score at baseline of < 36 and following treatment of < 43 were predictive of a depressive disorder.Conclusions: The SEQ-DA is a very simple self-report measure that can be used to predict which adolescents treated for depression are likely to remain depressed, thus prompting more intensive treatment and follow-up. [ABSTRACT FROM PUBLISHER]