In the previous study, we sent 5763 questionnaires to facilities equipped with MRI devices in Japan in order to survey policies on allocating MRI scan duties to pregnant employees. This study analyzed background factors in decision processes of allocation, in particular, a choice which represented a less-promoted allocation pattern before declaration of pregnancy. We focused on each respondent’s view for non-ionizing radiation （NIR） and physical load in MRI scan duties as possible factors in decision processes. Decision tree and binomial logistic regression analyses showed that these factors closely connected with decision processes in less-promoted allocation. Especially, concerns of adverse health effects caused by NIR exposure were strong motivations in making a judge for pregnant employee’s allocation.
In this study, I surveyed the implementation contents of health and safety management activities described in the “Report concerning the Conditions of Health and Safety Management”, which requested submissions from around 3,200 workplaces with more than 50 workers, to the Health and Safety Division of the Labour Standards Department in the Ibaraki Labour Bureau of the Ministry of Health, Labour and Welfare from FY 2013 - 2015 and FY2017. I compared the implementation contents of health and safety management activities for workplaces in which work-related accidents had occurred with those for workplaces in which no work-related accidents had occurred. Based on this comparison, I identified the issues with quantitative reasoning of the implementation contents of health and safety management activities in workplaces in which work-related accidents had occurred.
All workplaces in Ibaraki Prefecture, not only workplaces in which work-related accidents have occurred, but also those in which no work-related accidents have occurred should be able to improve the implementation contents of health and safety management activities by applying the issues identified in this study as more effective measures to prevent work-related accidents in the workplace.
Some fire and explosion incidents in the workplace including large chemical plants have occurred since 2011. It is pointed out that insufficient risk assessment has been implemented in using hazardous materials and chemical reaction of treating chemical substances due to understand insufficiently them. In this paper, the procedure and tool of risk assessment in Japan and overseas considering unintended reactions were surveyed, and issues in implementing risk assessment were coordinated. Moreover, the considerations of support measures for implementing risk assessment considering unintended reactions were investigated. Therefore, one of solutions is to show some typical scenarios related to some critical events (runaway reactions, fire and explosion due to chemical incompatibility, explosion of self-reactive materials etc.). These typical scenarios can be consulted in considering entire scenarios related to unintended reactions, and implementing risk assessment considering unintended reactions.
Spinal cord injuries are not frequent; however, the rate of early return to work for people who suffer from such injuries is low, and such injuries are a burden on patients, their families, and others involved. To clarify the frequency of spinal cord injuries on work sites, we analyzed 387 cases of work-related spinal cord injuries due to falls to a lower level, falls on the same level, and being caught between objects, from 2012 to 2014. Although the rate of injuries in the construction industry is high, the rates of spinal cord injuries in the tertiary industry and due to falls on the same level have significantly increased recently. The rates of spinal cord injuries were significantly high for the construction industry, falls to a lower level, male workers, and older workers compared with all work-related accidents. Furthermore, 55.5% of spinal cord injuries due to falls to a lower level happened over distances under three meters, and there is a possibility for severe injuries to happen if workers fall from over one meter. We expect that these findings provide fundamental data to prevent work-related accidents.
This study examined the effects of work-related behaviors (checking e-mails and overtime work at home) during off-job time on workers’ sleep quality, fatigue, and functional impairment at work in the context of improving the workplace environment (IWE). A manufacturing company conducted the IWE, and 36 workers participated in surveys conducted one month before and 3, 6, and 12 months after the IWE. The survey contained questions about demographic data, sleep quality, psychological detachment during off-job time, fatigue, functional impairment at work, and checking e-mail and overtime work at home during off-job time. Results revealed that functional impairment at work significantly deteriorated 3 months after compared with that one month before the IWE for only the workers engaging in overtime work at home, and they had significant severe functional impairment at work at 3, 6, and 12 months after, compared with the workers who did not engage in overtime work at home. Additionally, IWE significantly improved sleep quality and tended to improve fatigue. The checking e-mail had low psychological detachment, but those engaging in overtime work at home had not only low psychological detachment but also significant severe fatigue and tended to have poor sleep quality, compared to workers not engaging in these behaviors. These results suggest that work-related behaviors during off-job time affects functional impairment at work in the context of IWE. Therefore the work and rest style during off-job time may be key targets for IWE.
Labour accidents caused by electric shock which are absent from their work for four days or more were analyzed based on data base disclosed by Ministry of Health, Labour and Welfare between 2006 to 2015. As a result, the condition of labour accidents caused by electric shock in the qualitative expression was not very much change compared to that before 1998, and arc welders were one of the main causes of electric shock accidents.
Safety devices in South Korea and Australia, which are similar to automatic electric shock preventive device for AC arc welding equipment in Japan, were compared with those in Japan. As a result, the specifications on starting sensitivity, delay time and safety voltage for AC arc welding equipment in South Korea and Australia did not differ much from those in Japan.