In Japan, a study on mental health in workplace has expanded from tertiary to secondary and primary preventions of mental health disorders among employees. Recent movements suggest a trend of bringing numerous topics outside the industrial health, including those with perspectives from categories generally known as primordial prevention, such as enhancement of working life quality or improvement of work environment.

First, according to the aforementioned trends, the present paper made an effort to organize the terms and concepts related to mental health disorders, which included the foundation for research and practice in this area as well as the outcomes of discussions on the tertiary and secondary preventions.

Second, the primary models of work-related stress, along its impact on mental health, and the scales for assessing workers’ mental health issues were discussed, which have been used in numerous studies since the 1990s. The introduction of those models and scales contributed immensely to the expansion of this field’s research areas. However, a number of significant factors, most of which have social or cultural implications, can influence the connection between stress at workplace and health problems. Therefore, conducting large-scale study or systematic reviews targeting domestic cases exclusively is necessary to obtain evidence for establishing highly versatile measures against mental health problems in Japan.

Third, in this regard, several noteworthy large-scale research projects in Japan are highlighted as a hope for encouraging such studies in this field. However, the occupational health practitioners’ effort to understand the actual workplace situations where they attend to and to put the understanding into practice has been and will remain an indispensable attribute for them in the future.

Objective: Currently, there is no standardized questionnaire for regular workplace health check-ups in Japan. We considered that there are several issues associated with this, including the possibility that the questionnaire items are not useful for occupational health staff. Therefore, our study aimed to examine the questionnaire items required in regular health check-ups from the occupational health practice perspective and prepare a draft of a standardized medical questionnaire. The ultimate goal is to promote integrated management and utilization of the health-related information obtained from the questionnaire in the future. Methods: This non-interventional study, conducted from February 2018 to November 2020, examined the questionnaire items for the regular health check-up using the Delphi method. Twenty-two occupational health professionals, including occupational physicians and nurses with qualifications in occupational health, participated in the study. The self-administered questionnaires used by contracted industrial health associations across Japan were obtained, and items from all questionnaires were extracted. A survey questionnaire was then developed, consisting of eight primary headings: “personal attributes,” “work-related information and work history,” “life history and subjective symptoms,” “current and past medical history,” “family history,” and “pregnancy status,” with a total of 589 items. Participants were asked to rate the degree of necessity for each item, excluding the items in “personal attributes” and “pregnancy status.” The items with low ratings were excluded, and the remaining items were redesigned and distributed to the participants with the tabulated results. This process was repeated three times to allow the participants to rate the necessity of the items consistently. The questionnaire items with a consensus ratio exceeding 70% on the third try were adopted. The final adopted questionnaire items were again reviewed by the participants and agreed upon by all. Results: A total of 85 items were adopted under five primary headings, including 12 items for “work-related information and work history,” 11 for “life history,” 22 for “subjective symptoms,” 37 for “current medical history,” and three for “past medical history.” Conclusion: The items for the regular health check-up were finally adopted under the primary headings of “work-related information and work history,” “subjective symptoms,” and “current medical history.” We assumed that these items provide an overview of health information that can be utilized in occupational health practice. Based on our findings, there is a need to develop a standardized questionnaire for regular health check-ups and to consider the management and utilization of workers’ health information.

Objectives: The “Guidelines for Ensuring the Safety and Health of Older Workers (hereafter referred to as “Guidelines”),” formulated in 2021, require employers to implement measures that proactively prevent occupational accidents among older workers. This study aimed to clarify the status of awareness of the Guidelines and workplace improvement efforts with consideration of older workers, focusing on company size. Methods: Overall, 780 businesses in Wakayama Prefecture, Japan, were randomly selected from a Wakayama Occupational Health Support Center workplace list. Anonymous self-administered questionnaires were distributed by mail. The questionnaires comprised questions about the workplace, status of awareness of the Guidelines, comprehensive management of safety and health, considerations for working conditions, workers, workload reduction, work posture, work environment, and safety and health. Results: One hundred and seventy-one businesses (effective response rate: 21.9%) provided questionnaires with complete responses. For the Guidelines, 39.0% of small-sized (less than 50 employees) businesses answered, “never even heard of the name,” while many medium-sized (50–99 employees) and large-sized (100 or more employees) businesses answered that they had heard of the name but did not exactly know about it (33.3% of medium-sized businesses and 47.8% of large-sized businesses). Regarding the system that subsidizes the expenses required for the improvement of a working environment for older workers to work safely and securely (hereinafter referred to as the subsidy system), many businesses of all sizes answered that they had “never even heard of the name.” In the comprehensive management of safety and health, half of the businesses of all sizes had developed a system that made it easy to consult about the risk against occupational accidents of older workers. Regardless of size, more than half of businesses were able to consider working conditions and workers. However, there were only a few items where more than half of the businesses considered workload reduction, work posture, work environment, and safety and health, regardless of business size. It became clear that workplace improvement had not progressed very much. Conclusions: These results suggest that to promote workplace improvement that considers older workers, it is necessary to disseminate the Guidelines and proactively take on workplace improvement by utilizing the subsidy system.