title: Clinical assessment of bipolar depression: validity, factor structure and psychometric properties of the Korean version of the Bipolar Depression Rating Scale (BDRS).
abstract: The Bipolar Depression Rating Scale (BDRS) is a scale for assessment of the clinical characteristics of bipolar depression. The primary aims of this study were to describe the development of the Korean version of the BDRS (K-BDRS) and to establish more firmly its psychometric properties in terms of reliability and validity.
  
  
  
  The study included 141 patients (62 male and 79 female) who had been diagnosed with bipolar disorder, were currently experiencing symptoms of depression, and were interviewed using the K-BDRS. Other measures included the Montgomery and Asberg Depression Scale (MADRS), the 17-item Hamilton Depression Scale (HAMD), and the Young Mania Rating Scale (YMRS). Additionally, the internal consistency, concurrent validity, inter-rater reliability, and test-retest reliability of the K-BDRS were evaluated.
  
  
  
  The Cronbach's α-coefficient for the K-BDRS was 0.866, the K-BDRS exhibited strong correlations with the HAMD (r = 0.788) and MADRS (r = 0.877), and the mixed symptoms score of the K-BDRS was significantly correlated with the YMRS (r = 0.611). An exploratory factor analysis revealed three factors that corresponded to psychological depressive symptoms, somatic depressive symptoms, and mixed symptoms.
  
  
  
  The present findings suggest that the K-BDRS has good psychometric properties and is a valid and reliable tool for assessing depressive symptoms in patients with bipolar disorder.
authors.affiliation: Department of Psychiatry, School of Medicine, Jeju National University, Jeju, Republic of Korea.
authors.forename: Young-Eun
authors.initials: YE
authors.lastname: Jung
authors.affiliation: Department of Psychiatry, School of Medicine, Jeju National University, Jeju, Republic of Korea. mdkim66@jejunu.ac.kr.
authors.forename: Moon-Doo
authors.initials: MD
authors.lastname: Kim
authors.affiliation: Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea. wmbahk@catholic.ac.kr.
authors.forename: Won-Myong
authors.initials: WM
authors.lastname: Bahk
authors.affiliation: Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
authors.forename: Young Sup
authors.initials: YS
authors.lastname: Woo
authors.affiliation: Department of Psychiatry, Catholic University of Daegu, School of Medicine, Daegu, Republic of Korea.
authors.forename: Jonghun
authors.initials: J
authors.lastname: Lee
authors.affiliation: Department of Psychiatry, Bongseng Memorial Hospital, Busan, Republic of Korea.
authors.forename: Sae-Heon
authors.initials: SH
authors.lastname: Jang
authors.affiliation: Department of Psychiatry, Kyungpook National University School of Medicine, Daegu, Republic of Korea.
authors.forename: Seunghee
authors.initials: S
authors.lastname: Won
authors.affiliation: Department of Psychiatry, College of Medicine, Chung-Ang University, Seoul, Republic of Korea.
authors.forename: Kyung Joon
authors.initials: KJ
authors.lastname: Min
authors.affiliation: Department of Psychiatry, Chonbuk National University Medical School, Jeonju, Republic of Korea.
authors.forename: Sangkeun
authors.initials: S
authors.lastname: Chung
authors.affiliation: Department of Psychiatry, Chunan Soonchunhyang Hospital, Soonchunhyang University, Chunan, Republic of Korea.
authors.forename: Young-Joon
authors.initials: YJ
authors.lastname: Kwon
authors.affiliation: Department of Psychiatry, Sacred Heart Hospital, College of Medicine, Hallym University, Anyang, Republic of Korea.
authors.forename: Duk-In
authors.initials: DI
authors.lastname: Jon
authors.affiliation: Department of Psychiatry, College of Medicine, Dongguk University, Gyeongju, Republic of Korea.
authors.forename: Kwanghun
authors.initials: K
authors.lastname: Lee
authors.affiliation: Department of Psychiatry, Naju National Hospital, Naju, Republic of Korea.
authors.forename: Bo-Hyun
authors.initials: BH
authors.lastname: Yoon
mesh_terms: D000328:Adult; D001714:Bipolar Disorder / Q000150:complications / Q000175:diagnosis*; D003863:Depression / Q000150:complications / Q000175:diagnosis*; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D015588:Observer Variation; D011569:Psychiatric Status Rating Scales / Q000706:statistics & numerical data*; D011594:Psychometrics; D015203:Reproducibility of Results; D056910:Republic of Korea; D055815:Young Adult
keywords: BDRS; Bipolar depression; Bipolar disorder; Korean; Reliability; Validity