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KMID : 1007420140120010032
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Mood and Emotion
2014 Volume.12 No. 1 p.32 ~ p.36
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Finding Optimal Cut Off Points of the Korean Version of the Patient Health Questionnaire-9(PHQ-9) for Screening Depressive Disorders
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Lee Seung-Hyun
Huh Yu-Jeong
Kim Jong-Hun
Han Chang-Su
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Abstract
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Objectives : Depressive disorder is one of mental disorders associated with suicide. PHQ-9 is widely used screening instrument for depression in clinical settings. However, there is considerable divergence of opinion about cutoff points of the PHQ-9. The aim of this study was to find the valid, optimal cutoff points to screen depressive disorders using the Korean version of PHQ-9.
Methods : 139 psychiatric patients who were diagnosed as MDD, dysthymic disorder, depressive disorder not otherwise specified, and other non-psychotic psychiatric disorders with the M.I.N.I. PLUS were recruited. Subsequently, the PHQ-9, HDRS, PHQ-15, MMPI-Depression scale were administered. Reliability, validity and the ROC curve analysis were performed.
Results : The internal reliability using Cronbach’s alpha was relatively high (Cronbach’s alpha=0.85). In addition, correlations of the PHQ-9 with the HDRS, PHQ-15 and MMPI-Depression scale were 0.691, 0.582, and 0.404_ (p＜.01). Between the depression and non-depression groups, the AUC_ (area under the ROC curve) was 0.712_ (standard error=0.051, p＜.001) and the PHQ-9 had a cut-off point of 6_ (sensitivity 91.5%, specificity 33.3%). Between MDD and non-MDD groups, the AUC was 0.827 (standard error=0.035, p＜.001) and the PHQ-9 had a cut-off point of 10_ (sensitivity 86.5%, specificity 52.9%).
Conclusion : The PHQ-9 is considered as a short and valid tool to identify MDD (PHQ-9 total score 10).
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KEYWORD
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Major depressive disorder, Depression, Patient Health Questionnaire-9, Cut-off point
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