Journal List > J Korean Neuropsychiatr Assoc > v.51(2) > 1017619

Kwak, Kim, Choi, Kim, Jung, Lee, Sung, Sakong, Shin, and Jung: Study on Standardization of Korean Version of Psychiatric Diagnostic Screening Questionnaire : The Optimal Cutoff Scores



An exact diagnosis and comorbidity analysis are important in psychiatric disorders. The Psychiatric Diagnostic Screening Questionnaire (PDSQ) is both useful as a self-reporting test for screening psychiatric disorders and available for clinical settings due to its simplicity and convenience. This study, as a part of standardization of Korean version of Psychiatric Diagnostic Screening Questionnaire (K-PDSQ), evaluated optimal cutoff scores.


The samples were 696 patients in total, who were selected from the psychiatric departments of 3 university hospitals from March 2008 to August 2011. Diagnosing by Mini-International Neuropsychiatric Interview-Plus (MINI-Plus), we evaluated sensitivity, specificity, cutoff scores, ROC curve, and area under the curve (AUC) of K-PDSQ. SPSS version 12.0 for Windows and MedCalc version 12.0 were used to analyze the results.


With a cutoff score of 9 for major depressive disorder in K-PDSQ, both the sensitivity and specificity were 80%. The cutoff scores of PTSD, OCD, panic disorder, agoraphobia, psychosis, alcohol related problem, GAD, hypochondriasis, and social phobia of K-PDSQ were 5, 2, 4, 2, 1, 2, 5, 4, and 5, respectively. In most of the subscales, each AUC was above 0.75.


By applying the cutoff scores estimated above, we expect K-PDSQ to help provide diagnostic assessments and to grasp comorbidities before a clinical interview in the setting of busy outpatient clinics.

Figures and Tables

Fig. 1
Receiver operating curves for each of K-PDSQ subscale in 696 psychiatric patients. All curves were significant (p<0.001). MDD : Major depressive disorder, PTSD : Posttraumatic stress disorder, OCD : Obsessive-compulsive disorder, Panic : Panic disorder, Alcohol : Alcohol-related problems, GAD : Generalized anxiety disorder, Social : Social phobia, K-PDSQ : Korean version of Psychiatric Diagnostic Screening Questionnaire.
Table 1
Demographic characteristics of total patients

* : Others could include private businessmen, farmers, free-lancers, students and so on. M : Mean, SD : Standard deviation, n : Number

Table 2
DSM-IV diagnoses by MINI-Plus

* : Individuals could be given more than one diagnosis. DSM-IV : Diagnostic and statistical Manual of Mental Disorders-Fourth edition, MINI-Plus : Mini-International Neuropsychiatric Interview-Plus, n : Number

Table 3
Sensitivity and specificity of K-PDSQ subscales at different cutoff scores in 696 psychiatric patients

MDD : Major depressive disorder, PTSD : Posttraumatic stress disorder, OCD : Obsessive-compulsive disorder, Panic : Panic disorder, Agor : Agoraphobia, Psychos : Psychosis, Alcohol : Alcohol-related problems, GAD : Generalized anxiety disorder, Hypocho : Hypochondriasis, Social : Social phobia, K-PDSQ : Korean version of Psychiatric Diagnostic Screening Questionnaire

Table 4
Recommended cutoff scores, AUC, 95% confidence interval, and significance level P of each subscale

AUC : Area under the curve, CI : Confidence interval, MDD : Major depressive disorder, PTSD : Posttraumatic stress disorder, OCD : Obsessive-compulsive disorder, Panic : Panic disorder, Alcohol : Alcohol-related problems, GAD : Generalized anxiety disorder, Hypocho : Hypochondriasis, Social : Social phobia


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