Journal of Occupational Health
Online ISSN : 1348-9585
Print ISSN : 1341-9145
ISSN-L : 1341-9145
Current issue
Displaying 1-23 of 23 articles from this issue
Original Articles
  • Naana Mori, Daisuke Miyanaka, Masahito Tokita, Michiko Kawada, Keiko S ...
    Article type: ORIGINAL ARTICLE
    2024 Volume 66 Issue 1 Article ID: uiad001
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Objectives: This study examined the relationship between recovery experience, job demands, psychological distress, and temporomandibular disorders (TMD) in Japanese workers.

    Methods: It used cross-sectional data from the fourth survey of a multi-wave longitudinal project, conducted using the registered monitors of an internet research company. Finally, 1278 respondents’ data were analyzed (655 males, 623 females; mean [SD] age = 41.63 [10.31] years). We utilized Sugiaski’s TMD screening question to assess TMD prevalence, Brief Job Stress Questionnaire to assess job demands, Kessler Psychological Distress Scale (K6) to assess psychological distress, and the Japanese version of the Recovery Experience Questionnaire to assess recovery experiences. The moderated mediation analysis was conducted using the Process macro program for SPSS developed by Preacher and Hayes, examining the effect of job demands on TMD through psychological distress, moderated by the recovery experience.

    Results: The results showed that 13.1% (n = 168) of the respondents had TMD. Mediation analysis indicated high job demands were associated with an increased TMD prevalence through psychological distress. The moderated mediation analysis revealed that relaxation and control moderated the relationship between job demands and psychological distress.

    Conclusions: This cross-sectional study established the relationship between job demands, psychological distress, and TMD among Japanese workers. The findings suggest that increased job demands contribute to high TMD prevalence through the mediation of psychological distress, moderated by relaxation and control.

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  • Shinhyeong Kim, Seunghon Ham, Seong-Kyu Kang, Won-Jun Choi, Wanhyung L ...
    Article type: ORIGINAL ARTICLE
    2024 Volume 66 Issue 1 Article ID: uiad004
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Objectives: The present study aimed to identify and compare the associations between long working hours and use of work-related communication devices outside regular working hours and anxiety symptoms, thereby providing insight into redefining working hours.

    Methods: Based on the cross-sectional data from the sixth Korean Working Conditions Survey (KWCS), specifically the responses from 46 055 workers, the use of work-related communication devices outside of regular working hours, long working hours, and anxiety symptoms were assessed. To investigate the associations between using work-related communication devices outside regular working hours or long working hours with anxiety symptoms, odds ratios (ORs) and 95% CIs were calculated using multiple logistic regression models.

    Results: Among 46 055 participants, 25 659 (55.7%) used work-related communication devices outside working hours, 8145 (17.7%) worked long hours, and 2664 (5.8%) experienced anxiety symptoms. Compared with the reference group, those who used work-related communication devices outside regular working hours without working long hours, had higher OR of anxiety symptoms (OR: 2.18; 95% CI, 1.97-2.41) than those who worked long hours without using work-related communication devices during off-hours (OR: 1.32; 95% CI, 1.09-1.59). Furthermore, the group that both worked long hours and used work-related communication devices outside working hours exhibited the highest OR of anxiety symptoms (OR: 2.57; 95% CI, 2.24-2.97).

    Conclusions: Using work-related communication devices outside regular working hours is associated with a higher risk of anxiety symptoms compared with long working hours. This result suggests that using work-related devices outside regular working hours, in addition to regular work time, should be considered when redefining working hours.

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Review Articles
  • Veruscka Leso, Luca Scalfi, Angela Giordano, Liberata Reppuccia, David ...
    Article type: REVIEW ARTICLE
    2024 Volume 66 Issue 1 Article ID: uiad006
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Objectives: Work ability (WA) reflects a balance between work demands and an individual’s ability to meet them. It is influenced by several occupational and health-related factors including the individual’s physical fitness (PF). Therefore, the aim of the present study was to provide an overview of the possible relationship between PF measures and the individual’s WA.

    Methods: A systematic review of studies published up to December 1, 2022 and available in PubMed, Scopus, and ISI Web of Science databases, was performed. Results have been summarized according to the specific PF parameter explored.

    Results: The 14 reviewed studies, enrolling 47 to 1005 workers, all showed a satisfactory methodological quality. Some positive evidence emerged for a possible association between changes in aerobic capacity, walking speed, balance, flexibility, muscle strength, and WA perception. However, the limited number of studies, their cross-sectional design, the different PF performance indicators, populations, and job tasks explored prevented definite conclusions.

    Conclusions: Future longitudinal studies should be planned to confirm such positive results and identify PF indicators better predictive for changes in the WA of employees engaged in specific job tasks, particularly in physically demanding activities. This may be helpful to include PF performance tests in occupational health practice as an integrated part of risk assessment and management strategies as well as in health and well-being promotion plans.

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Brief Reports
  • Marquell Johnson, Saori Braun, Michelle Hecimovich, Katrina Schultz, C ...
    Article type: BRIEF REPORT
    2024 Volume 66 Issue 1 Article ID: uiad005
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Background: There are limited data on objectively measured activity and postural behaviors of law enforcement officers (LEOs) in relation to risk of metabolic syndrome (MetS).

    Objectives: To examine the associations between objectively measured activity and postural behaviors and MetS risk among LEOs.

    Methods: Thirty-one LEOs, mean (SD) age 33 (10) years, participated in the study. LEOs had their metabolic risk factors measured using blood samples after fasting for at least 10 hours prior to testing. Participants wore activity-monitoring devices for 7 consecutive days during on-duty and off-duty shifts. Eighteen participants adhered to wearing the devices. Descriptive statistics were used to determine means for all MetS risk factors; time in intensity-specific physical activity behaviors; and time in various postural shifts. Correlation analyses were employed to examine relationships between activity behaviors, postures, and MetS risk factors.

    Results: Over half (51.6%; n = 16) of the participants had 2 or more positive MetS risk factors. Mean (SD) on-duty sedentary behavior was 273 (59) minutes compared with off-duty sedentary behavior of 401 (146) minutes. Mean on-duty moderate-intensity activity was 236 (40) minutes compared with off-duty moderate-intensity activity of 305 (80) minutes. Average on-duty sitting time was 435 (69) minutes compared with off-duty sitting time of 528 (142) minutes. Average on-duty standing time was 116 (43) minutes compared with off-duty standing time of 171 (51) minutes. There were negative correlations between on-duty sedentary activity and Systolic Blood Pressure (r = −0.48) and Diastolic Blood Pressure (r = −0.48), respectively.

    Conclusions: Law enforcement officers have unfavorable activity and postural behaviors during a typical day regardless of working status and may be at risk for developing MetS.

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Opinions
  • Naomichi Tani, Hiroaki Fujihara, Kenji Ishii, Yoshiyuki Kamakura, Mafu ...
    Article type: OPINION
    2024 Volume 66 Issue 1 Article ID: uiad003
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Digital health technology has been widely applied to mental health interventions worldwide. Using digital phenotyping to identify an individual’s mental health status has become particularly important. However, many technologies other than digital phenotyping are expected to become more prevalent in the future. The systematization of these technologies is necessary to accurately identify trends in mental health interventions. However, no consensus on the technical classification of digital health technologies for mental health interventions has emerged. Thus, we conducted a review of systematic review articles on the application of digital health technologies in mental health while attempting to systematize the technology using the Delphi method. To identify technologies used in digital phenotyping and other digital technologies, we included 4 systematic review articles that met the inclusion criteria, and an additional 8 review articles, using a snowballing approach, were incorporated into the comprehensive review. Based on the review results, experts from various disciplines participated in the Delphi process and agreed on the following 11 technical categories for mental health interventions: heart rate estimation, exercise or physical activity, sleep estimation, contactless heart rate/pulse wave estimation, voice and emotion analysis, self-care/cognitive behavioral therapy/mindfulness, dietary management, psychological safety, communication robots, avatar/metaverse devices, and brain wave devices. The categories we defined intentionally included technologies that are expected to become widely used in the future. Therefore, we believe these 11 categories are socially implementable and useful for mental health interventions.

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Original Articles
  • Sarah Tucker, Soundarya Jonnalagadda, Cheryl Beseler, Aaron Yoder, Ann ...
    Article type: ORIGINAL ARTICLE
    2024 Volume 66 Issue 1 Article ID: uiad002
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Objectives: Hazardous materials (HAZMAT) pose risks to the health and safety of professionals involved with transportation and emergency responses. Two distinct occupational groups that encounter HAZMAT events are first responders and professional drivers. Wearable technology is a tool that can assist with monitoring the health of professionals involved in HAZMAT events. The aim of this study was to compare and evaluate the perceptions of first responders and professional drivers on wearable technology and attitudes toward health monitoring.

    Methods: A survey was administered to first responders (n = 112) and professional drivers (n = 218). Statistical approaches included bivariate analysis, latent class analysis, logistic regression analysis, and path analysis for the variables of interest.

    Results: There were significant differences between the groups in perceptions of the benefits of monitoring certain health indicators. Professional drivers were more likely to have a history of wearable technology use compared with first responders (odds ratio [OR] = 10.1; 95% CI, 4.42-22.9), reported greater exposure to HAZMAT (OR = 4.32; 95% CI, 2.24-8.32), and were more willing to have their health data monitored by someone other than themselves (OR = 9.27; 95% CI, 3.67-23.4). A multinomial regression model revealed that occupation was not a significant predictor of class preference for acceptance of monitoring specific health indicators.

    Conclusions: Occupation appeared to be important but further analysis uncovered that characteristics of individuals within the occupations were more salient to the use of wearable technology. HAZMAT exposure, someone else monitoring health data, and experience with wearable technology use were found to be important factors for perceptions about benefits of health monitoring with wearable technology.

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Brief Reports
  • Ikhyun Joo, Kyungmin Baek
    Article type: BRIEF REPORT
    2024 Volume 66 Issue 1 Article ID: uiad007
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Objectives: Using cases in the Korean workplace, this study preliminarily investigated whether ISO 45001-certified and non-certified workplaces differ in 4 aspects of occupational safety and health (OSH) management.

    Methods: Data were obtained from the 2021 Survey on the Status of Safety and Health in the Workplace in Korea. This study used a matched-pair analysis of certified and non-certified workplaces.

    Results: The results suggest that although ISO 45001-certified workplaces have a more safety-friendly internal institutional context than non-certified workplaces, there is no significant difference in the number of injuries and fatalities.

    Conclusions: The results indicate that ISO 45001-certified workplaces do not achieve better OSH performance than non-certified workplaces because ISO 45001 remains in the early stages of expansion, and certification does not require the achievement of OSH performance. A longitudinal analysis is needed to confirm the accurate outcomes of ISO 45001 certification.

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Review Articles
  • Koji Mori, Kiminori Odagami, Mizuho Inagaki, Kenta Moriya, Hidenori Fu ...
    Article type: REVIEW ARTICLE
    2024 Volume 66 Issue 1 Article ID: uiad008
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Objectives: Given current labor force conditions, including population aging, keeping older workers engaged in work and motivated is important. Aging may alter the effects that psychological and environmental factors have on work engagement. We conducted a systematic review to understand the features of work engagement among older workers.

    Methods: A systematic search was conducted in July 2022 using 4 databases. The review included relevant articles that focused on participants aged 40 years and older.

    Results: Fifty articles were selected for our review, which were grouped into 5 categories: (1) studies examining the relationship between chronological age and work engagement, (2) studies investigating the moderating effects of age on the relationship between job-related psychological factors and work environment factors and work engagement, (3) studies comparing the relationship of job-related psychological factors and work environment factors with work engagement across different age groups, (4) studies exploring the relationship between work engagement and retirement intentions or continued employment beyond retirement age, and (5) other studies discussing work engagement in the context of older workers. Most articles focused on workers in Europe and the United States and used observational study designs.

    Conclusions: Work engagement increases with age, and is mainly mediated by increased emotional regulation. In addition, age moderates the relationships between various job-related psychological and work-environmental factors and work engagement. Work engagement is associated with working beyond retirement age. Organizations should understand the characteristics of work engagement among older workers and make age-conscious efforts to support them in adapting to social changes.

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Original Articles
  • Anna-Karin Mouazzen, Karin Blomberg, Maria Jaensson
    Article type: ORIGINAL ARTICLE
    2024 Volume 66 Issue 1 Article ID: uiad009
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Objectives: Interprofessional collaboration (IPC) among professionals in occupational health (OH) services is crucial when rendering a service to clients and customers. The aim of this study was to describe and compare perceptions relating to IPC among professionals working as OH providers in Sweden.

    Methods: This cross-sectional study with a descriptive and comparative design included 456 respondents representing different OH professions in Sweden. Data were collected using the Swedish short version of the Assessment of Interprofessional Team Collaboration Scale adapted for OH ([AITCS]-SII[OH]), with its 3 subscales Partnership, Cooperation, and Coordination, and were analyzed and presented descriptively. Items and sum scores were dichotomized into inadequate and adequate and compared between sexes, workplaces, types of employment, and professions.

    Results: According to the responses, items related to openness, honesty, and trust were perceived as adequate among the respondents. The findings show that perceptions about IPC differed among the professions. The perception of IPC also differed between different types of organizations.

    Conclusions: The results show diverse perceptions between professionals and organizations. The perception of IPC may be influenced by the professional’s education in occupational safety and health. Study findings may be used to support further development of IPC in the OH service for the benefit of the clients. To develop IPC in the best interests of both professionals and customers/clients, further studies need to be performed to gain a deeper understanding of IPC in the OH context.

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Field Studies
  • Yukiko Kikuchi, Yukiko Kudo, Makiko Hasebe, Reiko Sugiyama, Ryosuke Mu ...
    Article type: FIELD STUDY
    2024 Volume 66 Issue 1 Article ID: uiad010
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Objectives: To gain a comprehensive understanding of the occupational hazards encountered by home health care nurses in Japan and to elucidate the reality of harm they incur, the hazardous situations, and the protective measures taken.

    Methods: A questionnaire survey of managers of home health care nursing agencies in Japan was conducted, and 355 valid responses were obtained. The survey questions concerned the occupational hazards experienced by home health care nursing staff. The occupational hazards were classified into 6 categories, and responses were obtained regarding harm, hazardous situations, and protective measures in each category.

    Results: The types of harm that occurred at highest rates during the previous 3 years were emotional abuse by the patient or their family members, lower back pain resulting from improper posture while providing care, sexual harassment by the patients and their family members, automobile accidents while traveling to home care sites, and allergic reactions to the environment at home care sites. Some hazardous situations were caused by the unique environments of home care sites.

    Conclusions: In order to prevent the occurrence of harm, the development of risk assessment tools, educational initiatives to increase awareness of occupational hazards, and consideration of the financial and technical support that will enable the use of assistive devices in the practice of nursing techniques were considered necessary. The development of effective guidelines and manuals specific to the occupational hazards encountered by home health care nurses is an important challenge.

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Original Articles
  • Takuji Adachi, Hironobu Ashikawa, Kuya Funaki, Takaaki Kondo, Sumio Ya ...
    Article type: ORIGINAL ARTICLE
    2024 Volume 66 Issue 1 Article ID: uiad011
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Objectives: Currently available questionnaires have limited ability to measure physical activity (PA) using accelerometers as a gold standard. This study aimed to develop a PA questionnaire for middle-aged Japanese workers and propose a PA scoring system for predicting low moderate-to-vigorous PA (MVPA).

    Methods: A total of 428 participants (median age 49 years; 75.8% men) participated in a 7-day PA measurement using an accelerometer and a questionnaire. The association between questionnaire responses and low MVPA (<150 min/wk) was assessed by logistic regression analysis. A score was assigned to each response based on the correlation coefficients of the multivariate model. The ability of the sum score to predict low MVPA was assessed using the area under the receiver operating characteristic curve (AUC).

    Results: Five questionnaire items were used for measuring PA scores (range: 0-50; higher scores indicated a higher probability of low MVPA). The AUC was 0.741 (95% CI, 0.689-0.792), and the sensitivity and specificity at the optimal cut-off value were 66.7% and 68.2%, respectively. This predictive ability was slightly increased by body mass index (AUC 0.745 [95% CI, 0.693-0.796]; sensitivity 69.9%; specificity 66.9%). These predictive values were greater than those of conventional questionnaires used in health checkups in Japan (P < .05).

    Conclusions: This questionnaire-based PA scoring system showed moderate accuracy in predicting low MVPA. It is useful for screening physically inactive workers and promoting PA.

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  • Tsubasa Otsubo, Aya Kinjo, Yuki Kuwabara, Ki Hongja, Yoneatsu Osaki
    Article type: ORIGINAL ARTICLE
    2024 Volume 66 Issue 1 Article ID: uiad012
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Objectives: Presenteeism is a critical issue in occupational health. This study aimed to examine the association between presenteeism and subjective sleep quality, smoking status, and alcohol consumption.

    Methods: Anonymous data of 777 workers in a Japanese city were retrospectively obtained from City Government Office A. They included variables like absolute presenteeism scores (measured using the Japanese version of the World Health Organization Health and Work Performance Questionnaire short form), gender, age, family status, subjective sleep quality, smoking status, and alcohol consumption. A binary logistic regression analysis was performed with gender, age, family status, subjective sleep quality, smoking status, and alcohol consumption as the independent variables, and absolute presenteeism scores equal to or below 40 as the dependent variable. A gender-stratified binary logistic regression analysis was also performed.

    Results: The logistic regression analysis results revealed that absolute presenteeism was positively associated with poor subjective sleep quality among all respondents (odds ratio [OR], 1.70; 95% CI, 1.18-2.44) and men (OR, 1.85; 95% CI, 1.12-3.05) and with current drinkers among women (OR, 3.49; 95% CI, 1.36-8.92); it was negatively associated with age among those who were ≥50 years old (OR, 0.50; 95% CI, 0.27-0.93) and with current drinkers among men (OR, 0.43; 95% CI, 0.20-0.92).

    Conclusions: The factors associated with presenteeism differed between men and women office workers, suggesting that gender differences need to be considered when working toward improving workers’ productivity.

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Review Articles
  • Charlotte E. Hall, Samantha K. Brooks, Freya Mills, Neil Greenberg, Da ...
    Article type: REVIEW ARTICLE
    2024 Volume 66 Issue 1 Article ID: uiad013
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Introduction: The concept of “working from home” is extremely topical following the COVID-19 pandemic; therefore, it is unsurprising that there has been an increased interest in collating research related to homeworking. This has been carried out by multiple reviews, all with slightly different research aims and methodologies. Collating the findings from the available reviews is therefore highly beneficial to establish the experience of homeworking to create recommendations for the future of home-based work.

    Methods: An umbrella review was carried out. In June 2022, literature searches were conducted across 4 electronic databases. Published reviews of literature that used a systematic process, were focused on working from home populations, and detailed factors that could be related to the personal experience of homeworking (eg, barriers, facilitators, advantages, disadvantages) were included.

    Results: A total of 1930 records were screened and 6 review articles were included. Results report on the following sections: working environment (eg, workplace design, space conditions), personal impact (eg, satisfaction, career impact), and health (eg, physical health, well-being) including a total of 19 themes. Mixed findings were apparent for nearly all included themes, highlighting the need to consider individual and contextual circumstances when researching working from home.

    Conclusions: This review establishes the importance of retaining flexibility while homeworking for employees, managers, and organizations. Essentially, a one-size-fits-all approach to working from home is impractical as individual circumstances limit application. Eight recommendations for the future of working from home are suggested.

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Original Articles
  • Yoichi Minakawa, Shogo Miyazaki, Hideaki Waki, Yoshiko Akimoto, Kazuno ...
    Article type: ORIGINAL ARTICLE
    2024 Volume 66 Issue 1 Article ID: uiad016
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Objectives: To evaluate whether trigger point acupuncture (TrPA) is beneficial for office workers who have reduced job performance (presenteeism) due to chronic neck and shoulder pain (katakori).

    Methods: A 4-week single-center randomized controlled trial was conducted on 20 eligible female office workers with chronic neck and shoulder pain of at least 3-month duration. The control group implemented only workplace-recommended presenteeism measures, whereas the intervention group received TrPA up to 4 times per month in addition to the presenteeism measures recommended by each workplace. The major outcome measure was the relative presenteeism score on the World Health Organization Health and Work Performance (WHO-HPQ). The secondary outcome measures were pain intensity (numerical rating scale), absolute presenteeism (WHO-HPQ), anxiety and depression (Hospital Anxiety and Depression Scale; HADS), catastrophic thoughts related to pain (Pain Catastrophizing Scale; PCS), and sleep (Athens Insomnia Scale; AIS).

    Results: All 9 cases in the intervention group and 11 cases in the control group were analyzed. TrPA up to 4 times per month reduced the intensity of neck and shoulder pain by 20% (P < .01, d = 1.65) and improved labor productivity (relative presenteeism value) by 0.25 (P < .01, d = 1.33) compared with the control group over 1 month. No significant differences were observed between the 2 groups in terms of absolute presenteeism score, HADS, PCS, or AIS.

    Conclusions:These results suggest that regular intervention with TrPA may be effective in the relative presenteeism score before and after the intervention and the degree of neck and shoulder pain over 28 days compared with the control group.

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  • Satoru Kanamori, Takahiro Tabuchi, Yuko Kai
    Article type: ORIGINAL ARTICLE
    2024 Volume 66 Issue 1 Article ID: uiad014
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Objectives: This study aimed to clarify the association between telecommuting environments and somatic symptoms among teleworkers in Japan.

    Methods: This cross-sectional study, conducted from September 27 to October 29, 2021, used data from the Japan COVID-19 and Society Internet Survey (JACSIS study) in Japan. Of the 31 000 male and female respondents, who were Japanese residents aged 15-79 years and were randomly selected from the panel members of an internet survey company, 4569 home-based teleworkers were finally included in the analysis; 26 431 respondents who met the exclusion criteria were excluded. The analysis included 4 cut-offs (≥4, 8, 12, and 16 points) for somatic symptoms on the Somatic Symptom Scale-8 as objective variables, and the telecommuting environment, such as having adequate desk light and a quiet environment, as explanatory variables. Adjusted Poisson regression analysis was conducted using demographic variables as covariates.

    Results: The prevalence ratio (PR) for somatic symptoms increased significantly as the number of poor telecommuting conditions increased, regardless of the cut-off value for somatic symptoms or the frequency of teleworking. In the telecommuting environment, the PR for somatic symptoms was significantly higher for the following 6 items: poor teleworking space to concentrate, inadequate foot space, poor communication environment, poor space for relaxation, noise, and inappropriate temperature and humidity.

    Conclusions: These results suggest that for home-based teleworkers, the more inadequate the telecommuting environment, especially in the aforementioned 6 areas, the higher the likelihood of somatic symptoms. Improving these environments may be useful in preventing various somatic symptoms.

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  • Yoshihisa Fujino, Makoto Okawara, Ayako Hino, Keiji Muramatsu, Tomohis ...
    Article type: ORIGINAL ARTICLE
    2024 Volume 66 Issue 1 Article ID: uiad015
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Objectives: Presenteeism adversely affects workers’ quality of life, leading to further deterioration of their health and affecting their ability to continue working. Unemployment is one of the most serious consequences for workers experiencing presenteeism. A worker’s ability to work depends on the degree of mismatch between their health status and job demands and work factors. The COVID-19 pandemic has affected workers’ experiences of presenteeism as well as their employment status. We examined the association between presenteeism and risk of job resignations and unemployment among Japanese workers during the COVID-19 pandemic.

    Methods: A prospective study of 27 036 internet monitors was conducted, starting in December 2020, with 18 560 (68.7%) participating in the follow-up by December 2021. The Work Functioning Impairment Scale (WFun) was used to measure the degree of work function impairment.

    Results: The group with the highest WFun scores had higher odds ratios (ORs) for both retirement and unemployment for health reasons than the group with the lowest WFun scores. ORs were 2.99 (95% CI, 2.48-3.62; P < .001) and 1.82 (95% CI, 1.65-2.00; P < .001), respectively.

    Conclusions: Workers with work functioning impairment are at increased risk of resignation or unemployment. Management strategies for workers with work functioning impairment are needed to reduce their disadvantages in employment.

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Letters to the Editor
Original Articles
  • Mustapha Amoadu, Edward Wilson Ansah, Jacob Owusu Sarfo
    Article type: ORIGINAL ARTICLE
    2024 Volume 66 Issue 1 Article ID: uiad019
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Objective: This study sought to examine the association between psychosocial work factors and road traffic crashes (RTCs), and test the differences in psychosocial work factors between minibus and long-bus drivers.

    Methods: This cross-sectional survey employed a convenient sampling method to collect data from 7315 long-distance minibus and long-bus drivers who operate between the Ghanaian cities, Accra and Tema and other parts of the country. The drivers answered a job content questionnaire, psychosocial safety climate scale (PSC-12), work-family conflict scale, and demographic questions on age, education, driving hours, and RTC history.

    Results: The correlational analysis showed a significant association between psychosocial work factors and RTCs for the previous 2 years. Hierarchical multiple linear regression found that supervisor support, skill discretion, decision autonomy, psychological demands, PSC, and work-family conflict significantly contributed to explaining RTC rates among the drivers. Also, significant differences were found between minibus and long-bus drivers in driving hours, occurrence of near misses, RTCs, and all psychosocial work factors explored in this study except work-family conflict.

    Conclusions: Psychosocial work factors directly predict RTCs among minibus and long-bus drivers. Policymakers, driver unions, and owners and managers of bus transport businesses should prioritize integrating occupational health and safety into road transport activities. Furthermore, managers and bus owners should use bottom-up communication, provide access to support services and work-family balance initiatives, flexible work schedules, and a supportive work environment to improve road safety.

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Review Articles
  • Immad A. Shah, SukhDev Mishra
    Article type: REVIEW ARTICLE
    2024 Volume 66 Issue 1 Article ID: uiad017
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Objectives: In an era characterized by dynamic technological advancements, the well-being of the workforce remains a cornerstone of progress and sustainability. The evolving industrial landscape in the modern world has had a considerable influence on occupational health and safety (OHS). Ensuring the well-being of workers and creating safe working environments are not only ethical imperatives but also integral to maintaining operational efficiency and productivity. We aim to review the advancements that have taken place with a potential to reshape workplace safety with integration of artificial intelligence (AI)-driven new technologies to prevent occupational diseases and promote safety solutions.

    Methods: The published literature was identified using scientific databases of Embase, PubMed, and Google scholar including a lower time bound of 1974 to capture chronological advances in occupational disease detection and technological solutions employed in industrial set-ups.

    Results: AI-driven technologies are revolutionizing how organizations approach health and safety, offering predictive insights, real-time monitoring, and risk mitigation strategies that not only minimize accidents and hazards but also pave the way for a more proactive and responsive approach to safeguarding the workforce.

    Conclusion: As industries embrace the transformative potential of AI, a new frontier of possibilities emerges for enhancing workplace safety. This synergy between OHS and AI marks a pivotal moment in the quest for safer, healthier, and more sustainable workplaces.

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  • Lorenzo Bonatesta, Stefano Palermi, Felice Sirico, Mario Mancinelli, P ...
    Article type: REVIEW ARTICLE
    2024 Volume 66 Issue 1 Article ID: uiae002
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Objectives: Corporate health programs (CHPs) aim to improve employees’ health through health promotion strategies at the workplace. Physical activity (PA) plays a crucial role in primary prevention, leading many companies to implement PA-based CHPs. However, there is limited examination in the scientific literature on whether PA-based CHPs (PA-CHPs) lead to economic benefits. This systematic review aimed to summarize the available literature on the economic aspects of PA-CHPs.

    Methods: A systematic review was conducted to identify studies focused on PA-CHPs targeting healthy sedentary workers and reporting at least one economic outcome, such as return on investment (ROI), costs, or sick leave.

    Results: Of 1036 studies identified by our search strategy, 11 studies involving 60 020 participants met the inclusion criteria. The mean (±SD) cost per capita for PA-CHPs was estimated as 359€ (±238€) (95% CI, 357-361€). In 75% of the studies, the net savings generated by PA-CHPs in 12 months were reported, with an average of 1095€ (±865€) (95% CI, 496-1690€). ROI was assessed in 50% of the included studies, with an average of 3.6 (±1.41) (95% CI, 2.19-5.01).

    Conclusions: In addition to promoting a healthy lifestyle, PA-CHPs have the potential to generate significant economic returns. However, the heterogeneity among the existing studies highlights the need for standardization and accurate reporting of costs in future research.

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Original Articles
  • Kazuhiko Watanabe, Xi Lu, Shota Masuda, Takeshi Miyamoto, Takahiko Kat ...
    Article type: ORIGINAL ARTICLE
    2024 Volume 66 Issue 1 Article ID: uiae001
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Objectives: This study aimed to examine the relationship between physical activity (PA) and locomotive syndrome (LS) among young and middle-aged Japanese workers.

    Methods: This cross-sectional study included 335 participants from a company in Kumamoto, Japan. LS was evaluated using the 25-question Geriatric Locomotive Function Scale (GLFS-25); a GLFS-25 score ≥7 was defined as LS. Weekly PA was measured using the International Physical Activity Questionnaire. Work-related PA (time spent sitting, standing, walking, and strenuous work per day) and sedentary breaks were measured using a Work-related Physical Activity Questionnaire. Screen usage (television [TV], smartphones, tablets, and personal computers) during leisure time was recorded. The association between PA and LS was examined using a multivariate logistic regression analysis adjusted for age, sex, body mass index, history of musculoskeletal disorders, cancer, stroke, occupation, employment type, work time, shift system, employment status, and body pain.

    Results: A total of 149 participants had LS. Fewer sedentary breaks during work (>70-minute intervals, odds ratio [OR] = 2.96; prolonged sitting, OR = 4.12) and longer TV viewing time (≥180 minutes, OR = 3.02) were significantly associated with LS. In contrast, moderate PA (OR = 0.75) was significantly associated with a lower risk of LS.

    Conclusions: Fewer sedentary breaks during work and longer TV viewing time could increase the risk of LS in young and middle-aged Japanese workers.

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Case Studies
  • Takahiro Mori, Ryotaro Ito, Kenta Moriya, Seiichiro Tateishi, Tatsuhik ...
    Article type: CASE STUDY
    2024 Volume 66 Issue 1 Article ID: uiae004
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Background: Since the Fukushima Daiichi nuclear power plant (FDNPP) accident in 2011, measures have been taken to address occupational health risks, such as heat illness and infectious diseases, and ensure fitness for duty with the Tokyo Electric Power Company and its contractors. However, with the decommissioning operations set to span several decades and an aging workforce, there arose a need for proactive occupational health strategies that not only addressed these risks but also promoted employee health and created a comfortable work environment. With the Japanese government’s promotion of health and productivity management (HPM) for corporations, an HPM-based initiative was launched at the FDNPP in 2019.

    Case: We designed an HPM questionnaire tailored to the unique conditions at the FDNPP for contractors in 2019. Subsequently, we adjusted the questionnaire annually in light of evolving societal contexts and insights derived from contractors’ feedback. This initiative also involved the annual recognition of outstanding contractors. These efforts have led to a steady increase in the number of contractors participating in the HPM survey, with respondents’ scores continually improving. We also emphasized dissemination of HPM practices from contractors to their subcontractors due to the complex subcontracting structure at FDNPP, and our results showed that more contractors have been extending these efforts to their subcontractors.

    Conclusions: Our findings suggest that individual contractors are steadily enhancing their HPM efforts. We are committed to continually offering support to advance HPM throughout the FDNPP.

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Original Articles
  • Rasha A. Alamoush, Sereen Al-sawaeir, Dima Abu Baker, Sanaa A. Aljaman ...
    Article type: ORIGINAL ARTICLE
    2024 Volume 66 Issue 1 Article ID: uiae006
    Published: 2024
    Released on J-STAGE: March 30, 2024
    JOURNAL OPEN ACCESS

    Objectives: To assess the stress level, the impact of stress factors, and discrepancies between fourth- and fifth-year undergraduate clinical students at the University of Jordan.

    Methods: A cross-sectional study was conducted in the academic year 2022/2023. The study group included fourth- and fifth-year dental students at the University of Jordan (n = 382) who were asked to voluntarily fill in an online dental environment stress (DES) questionnaire. Analysis was conducted using Mann-Whitney U test, independent t-test, χ2 test, and Spearman ρ rank correlations. Statistical significance was inferred when P < .05.

    Results: Fourth-year students reported higher levels of nervousness before treating patients for the first time. Fifth-year students faced more difficulty, higher stress, and/or fear regarding the amount of assigned work, provided treatment, completed requirements, failing the course, time to finish assignments, patient comprehensive care, and financial expenses of the course. Comparison between groups revealed that the fifth-year students scored higher levels of stress on the total DES score and all partial DES scores. Furthermore, the total DES questionnaire scores were significantly correlated with grade point average (GPA) among the total study sample and the prosthodontics clinical course marks among the fourth-year students’ group.

    Conclusions: The stress level among students in clinical courses was influenced by their academic performance, gender, year level, and the type and time needed for the provided treatment. Completing course requirements was among the most commonly faced stressors. Future research endeavors might be considered to study each clinical factor, its impact on students’ stress level, and how to manage and positively improve these factors.

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