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Psychometric Properties of the Korean Version of Functioning Assessment Short Test in Bipolar Disorder
Hangoeunbi Kang 1, Bo-Hyun Yoon 1, Won-Myong Bahk 2,*, Young Sup Woo 2, Won Kim 3, Jonghun Lee 4, InKi Sohn 5, Sung-Yong Park 5, Duk-In Jon 6, Myung Hun Jung 6, Moon-Doo Kim 7, Young-Eun Jung 7, Hyung-Mo Sung 8, Young-Min Park 9, Jung Goo Lee 10, Sang-Yeol Lee 11, Seung-Ho Jang 11, Eun-Sung Lim 12, In Hee Shim , Kwanghun Lee , Sae-Heon Jang
Department of Psychiatry, Cancer Center, Dongnam Institute of Radiological and Medical Sciences, Busan, Korea, Department of Psychiatry, College of Medicine, Dongguk University, Gyeongju, Korea, Department of Psychiatry, Bongseng Memorial Hospital, Busan, Korea, 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, College of Medicine, Soonchunhyang University, 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, School of Medicine, Wonkwang University, Iksan, Korea, 12Department of Psychiatry, Shinsegae Hyo Hospital, Kimje, 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 4 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
Accepted Manuscript [Submitted on 2022-06-25, Accepted on 2022-08-04]