Clin Psychopharmacol Neurosci 2018; 16(3): 333-338  
Improving the Screening Instrument of Bipolar Spectrum Disorders: Weighted Korean Version of the Mood Disorder Questionnaire
Narei Hong1, Won-Myong Bahk2, Bo-Hyun Yoon3, Kyung Joon Min4, Young Chul Shin5, Duk-In Jon1
1Department of Psychiatry, Hallym University College of Medicine, Anyang, 2Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, 3Department of Psychiatry, Naju National Hospital, Naju, 4Department of Psychiatry, Chung-Ang University College of Medicine, Seoul, 5Department of Psychiatry, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
Correspondence to: Duk-In Jon, MD, PhD
Department of Psychiatry, Hallym University Sacred Heart Hospital, 22 Gwanpyeong-ro, 170 beon-gil, Dongan-gu, Anyang, 14068, Korea
Tel: +82-31-380-3752, Fax: +82-31-381-3753
E-mail: cogni@naver.com
ORCID: https://orcid.org/0000-0002-1565-7940
Received: April 26, 2018; Revised: May 8, 2018; Accepted: May 9, 2018; Published online: August 31, 2018.
© The Korean College of Neuropsychopharmacology. All rights reserved.

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Objective: It is not easy to diagnose bipolar disorders accurately in the clinical setting. Although Korean version of the Mood Disorder Questionnaire (K-MDQ) is easily administered, it still has weakness regarding case finding. In this study, we suggest a new weighted version of the K-MDQ to increase its screening power.
Methods: Ninety-five patients with bipolar disorders and 346 controls (patients with schizophrenia, patients with depressive disorders, patients with anxiety disorders, and subjects without any psychiatric disease) were enrolled in this study. The subjects received brief information on the K-MDQ, and then independently completed the questionnaire.
Results: Using odds ratios, we constructed a new weighted K-MDQ (W-K-MDQ). Item 1 (feel so good or hyper) was weighted 7 times and item 4 (less sleep) 3.5 times. Item 7 (easily distracted) and item 11 (more interested in sex) were excluded. Part 2 (simultaneity) and 3 (functional impairment) were also excluded as in the original K-MDQ. The sensitivity of the W-K-MDQ with a cutoff value of 10 was enhanced to 0.789. The area under the receiver operating characteristic curve was increased to 0.837.
Conclusion: We suggested a new formula for K-MDQ using 11 of its items. The W-K-MDQ can be easily applied with good sensitivity to screen for bipolar disorders in clinical settings in Korea. Further evaluations with larger samples are needed to establish the usefulness of the W-K-MDQ.
Keywords: Bipolar disorder; Differential diagnosis; Sensitivity.


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