“…Survey items addressed salary, 4 , 8 , 9 , 10 , 14 , 28 human relationships with superiors and colleagues, 4 , 8 , 10 , 11 , 14 , 29 support from the workplace in case of trouble, 5 , 6 , 7 promotion or official position, 5 care education and training, 8 , 9 , 10 discretionary responsibility level, 11 , 12 , 13 working hours or time off, 14 and number of workers. 12 , 15 In addition, based on the results of our interviews of 12 care workers in May 2018 to explore the QWL improvement factor (unpublished), we included questions addressing caregiving techniques and personal events. Responses were measured using a 5‐point scale with the following satisfaction levels: “very dissatisfied” (1), “dissatisfied” (2), “no opinion” (3), “satisfied” (4), and “very satisfied” (5).…”