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J Occup Health year 2007 volume 49 number 6 page 453 - 460
Classification Original
Title Development of Japanese Version of the Checklist Individual Strength Questionnaire in a Working Population
Author Yutaka Aratake1, Katsutoshi Tanaka1, Koji Wada2, Mayumi Watanabe1, Noritada Katoh1, Yumi Sakata1 and Yoshiharu Aizawa2
Organization 1 Department of Occupational Mental Health and 2 Department of Occupational Health, Graduate School of Medical Sciences, Kitasato University, Japan
Keywords Fatigue, CIS, Questionnaire, Reliability, Validity, Working population, Overtime hours, Sleep time
Correspondence Y. Aratake, Department of Occupational Mental Health, Graduate School of Medical Science, Kitasato University, 1-15-1 Kitasato, Sagamihara, Kanagawa 228-8555, Japan (e-mail: aratake-sgy@umin.ac.jp)
Abstract Development of Japanese Version of the Checklist Individual Strength Questionnaire in a Working Population: Yutaka Aratake, et al. Department of Occupational Mental Healthl, Graduate School of Medical Sciences, Kitasato University-The aims of the present study were to develop and validate the Japanese version of the checklist individual strength questionnaire (CIS) which is used to measure prolonged fatigue not only in the general population but also in the working population. We obtained permission to use CIS from its author and translated the questionnaire into Japanese. Then, the Japanese version of the questionnaire was translated back into English by a bilingual person. The author of the original version agreed that the back-translated version was conceptually and linguistically equivalent to the original CIS. To validate CIS, 399 workers (66.7% were men) from different companies answered the Japanese version of the CIS (CIS-J), Maslach burnout inventory-general survey (MBI-GS), Beck Depression Inventory-II (BDI-II), visual analogue scale (VAS) questionnaires for subjective fatigue, number of overtime hours and number of hours of sleep. Cronbach's alpha for the total CIS-J score was 0.91. The test-retest reliability assessed with an intra-class correlation coefficient was 0.82. Although confirmatory factor analysis did not show an ideal model fit, the correlation coefficients between the total CIS score and the MBI-GS exhaustion score, the BDI-II score and the VAS score were 0.58 (p<0.01), 0.66 (p<0.01) and 0.63 (p<0.01), respectively. The less workers slept and the longer they worked, the higher their total CIS score became. CIS-J showed good reliability and acceptable validity in the working population. Thus, it could be useful for studying fatigue among Japanese working populations.