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Nicole DECI6), Andreas KRAUSE7), Jan DETTMERS8)4)Utsunomiya Campus Liberal Arts Center, Teikyo University, Tochigi, Japan1)Department of Epidemiology and Social Medicine, Graduate School of Public Health, 5)Department of Foreign Languages, Institute of Foreign Languages, Teikyo University, Tokyo, Japan2)Department of Epidemiology and Environmental Health, Juntendo University Faculty of Medicine, Tokyo, Japan3)Department of Social Medicine, Graduate School of Medicine, International University of Health and Welfare, Tokyo, Japan8)Faculty for Psychology, University of Hagen, Germany6)MSH Medical School Hamburg, University of Applied Sciences and Medical University, 7)School of Applied Psychology, University of Applied Sciences and Arts Northwestern Switzerland, Olten, SwitzerlandKazuhito YOKOYAMA1, 2), Akinori NAKATA1, 3), Yuto KANNARI4), Frank NICKEL5), Development of the Japanese Version of the Self-Endangering Work Behavior (J-SEWB) Scale242Corresponding author: Kazuhito YokoyamaDepartment of Epidemiology and Social Medicine, Graduate School of Public Health, International University of Health and Welfare4-1-26 Akasaka, Minato-ku, Tokyo, JapanTEL: +81-3-5574-3959　E-mail: k.yokoyama@iuhw.ac.jp〔Received　Nov. 5, 2021〕〔Accepted　Feb. 2, 2022〕J-STAGE Advance published date: May. 27, 2022Copyright © 2022 The Juntendo Medical Society. This is an open access article distributed under the terms of Creative Commons Attribution License (CC BY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original source is properly credited. doi: 10.14789/jmj.JMJ21-0039-OAObjective: The concept of self-endangering work behavior (SEWB) was recently proposed to describe problematic behaviors to cope with heavy workloads and self-management. Although SEWB may enable workers to achieve immediate goals, it risks health and long-term work capacity. In this study, we developed a Japanese version of the SEWB (J-SEWB) scale, which was originally in German, and verified its validity and reliability.Materials: The original SEWB scale consisted of 21 items, constituting five subscales: “Intensification of working hours,” “Prolongation/extension of working hours,” “Refraining from recovery/leisure activities,” “Working despite illness,” and “Use of stimulating substances.” We translated the scale into Japanese, then checked the wording using back-translation.Methods: The J-SEWB scale and questions for working conditions and sociodemographic variables was administered via an online survey with 600 participants registered with an internet survey company in Japan. Cronbach’s α coefficients were calculated for each subscale to assess internal consistency. Construct validity was examined using principal factor analysis with equamax rotation. An analysis of variance evaluated the relationships of J-SEWB scores with working conditions and sociodemographic variables.Results: Cronbach’s α coefficients ranged from 0.846 to 0.964 for five subscales, and 0.957 for all 21 items (total J-SEWB score) in 600 participants. The factor analysis identified five factors, classifying 21 items into corresponding subscales. Total J-SEWB scores were significantly higher for flexible work as well as longer working hours.Conclusions: The J-SEWB scale appears to be an effective tool for assessing SEWB in Japanese employees, with satisfactory reliability and construct validity.Key words: self-endangering work behavior, overwork, presenteeism, flexible work styleJuntendo Medical Journal2022. 68(3), 242-250Original ArticlesInternational University of Health and Welfare, Tokyo, JapanDepartment of Psychology, Hamburg, Germany