Clin Psychopharmacol Neurosci.  2023 Feb;21(1):188-196. 10.9758/cpn.2023.21.1.188.

Psychometric Properties of the Korean Version of Functioning Assessment Short Test in Bipolar Disorder

Affiliations
  • 1Department of Psychiatry, Naju National Hospital, Naju, Korea.
  • 2Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Korea.
  • 3Department of Psychiatry, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
  • 4Department of Psychiatry, Daegu Catholic University School of Medicine, Daegu, Korea.
  • 5Department of Psychiatry, Keyo Hospital, Keyo Medical Foundation, Uiwang, Korea.
  • 6Department of Psychiatry, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.
  • 7Department of Psychiatry, College of Medicine, Jeju National University, Jeju, Korea.
  • 8Department of Psychiatry, Soonchunhyang University Gumi Hospital, Soonchunhyang University College of Medicine, Gumi, Korea.
  • 9Department of Psychiatry, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Korea.
  • 10Department of Psychiatry, Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea.
  • 11Department of Psychiatry, Wonkwang University Hospital, Wonkwang University School of Medicine, Iksan,Korea.
  • 12Department of Psychiatry, Shinsegae Hyo Hospital, Gimje, Korea.
  • 13Department of Psychiatry, Cancer Center, Dongnam Institute of Radiological and Medical Sciences, Busan, Korea.
  • 14Department of Psychiatry, Dongguk University College of Medicine, Gyeongju, Korea.
  • 15Department of Psychiatry, Bongseng Memorial Hospital, Busan, Korea.

Abstract


Objective
The Functioning Assessment Short Test (FAST) is a relatively specific test for bipolar disorders designed to assess the main functioning problems experienced by patients. This brief instrument includes 24 items assessing impairment or disability in 6 domains of functioning: autonomy, occupational functioning, cognitive functioning, financial issues, interpersonal relationships, and leisure time. It has already been translated into standardized versions in several languages. The aim of this study is to measure the validity and reliability of the Korean version of FAST (K-FAST).
Methods
A total of 209 bipolar disorder patients were recruited from 14 centers in Korea. K-FAST, Young Mania Rating Scale (YMRS), Bipolar Depression Rating Scale (BDRS), Global Assessment of Functioning (GAF) and the World Health Organization Quality of Life Assessment Instrument Brief Form (WHOQOL-BREF) were administered, and psychometric analysis of the K-FAST was conducted.
Results
The internal consistency (Cronbach’s alpha) of the K-FAST was 0.95. Test-retest reliability analysis showed a strong correlation between the two measures assessed at a 1-week interval (ICC = 0.97; p < 0.001). The K-FAST exhibited significant correlations with GAF (r = −0.771), WHOQOL-BREF (r = −0.326), YMRS (r = 0.509) and BDRS (r = 0.598). A strong negative correlation with GAF pointed to a reasonable degree of concurrent validity. Although the exploratory factor analysis showed four factors, the confirmatory factor analysis of questionnaires had a good fit for a six factors model (CFI = 0.925; TLI = 0.912; RMSEA = 0.078).
Conclusion
The K-FAST has good psychometric properties, good internal consistency, and can be applicable and acceptable to the Korean context.

Keyword

Functioning assessment short test; Bipolar disorder; Psychosocial functioning; Validation
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