한국어판 우울증상평가척도의 신뢰도 및 타당도 연구

Abstract

Objectives : The Inventory for Depressive Symptomatology (IDS) is a lately developed scale which has been reported as a valid tool for the assessment of depressive symptoms. It covers most symptoms of major depressive disorder described in the Diagnostic and Statistical Manual of Mental Disorders, fourth edition (DSM-IV) and has both self-report (IDS-SR) and clinician-rated (IDS-C) versions. In this study we assessed the reliability, validity and psychometric properties of the Korean version of the IDS (KIDS). Methods : Forty patients diagnosed as major depressive disorder according to the DSM-IV criteria and 36 healthy control people were enrolled in this study. They were assessed with KIDS-C, KIDS-SR, Montgomery-Åsberg Depression Rating Scale (MADRS), and Beck Depression Inventory (BDI) to examine cross-validation. Statistical analyses were performed using calculation of Cronbach’s alpha, Spearman Correlation Coefficient and Principal Component Analysis. Shortened versions of KIDS which has 16 items and called as the Korean Quick Inventory of Depressive Symptomatology (KQIDS) were also included in statistical analyses. Results : The Cronbach’s alpha coefficients of KIDS-C, KIDS-SR, KQIDS-C and KQIDS-SR were 0.96, 0.96, 0.92 and 0.92, respectively. The total score of KIDS-C showed significant correlations with those of MADRS and KQIDS-C (r=0.97 and 0.97, p＜0.001, respectively) and the total score of KIDS-SR also showed significant correlations with those of BDI and KQIDS-SR (r=0.86 and 0.97, p＜0.001, respectively). We suggested the cut-off value of KIDS-C, KIDS-SR, KQIDS-C and KQIDS-SR as 19, 18, 7 and 7, respectively when we consider both sensitivity and specificity by ROC curve analysis. Conclusion : These results showed that the KIDS could be a reliable and valid tool to measure depressive symptom severity in major depressive disorder. The KQIDS is also a useful and efficient scale for assessment of depressive symptoms in outpatient clinic or general population.