1 2383-336x Hamedan University of Medical Sciences 878 Safety Presenting a Model to Assess the Risk of Explosives Warehouse Hazards using the Combined Aras-Shannon's Entropy Methods in a Fuzzy Environment Soltani Edris b b Student Research Committee, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran 1 9 2023 10 2 69 80 24 04 2023 09 05 2023 Background and Objective: Explosives storage is considered one of the most dangerous working parts of mines where the people working there are exposed to all kinds of physical, chemical, and psychological risks and injuries that can negatively affect their health. Therefore, the current research aimed to provide a model for risk assessment of hazards in these warehouses. Materials and Methods: Firstly, using the Fine-Kinney risk assessment method, the effective criteria in determining the risks of explosives warehouse, including including intensity, probability and frequency of exposure were identified. Therafter, the weight of each criterion was calculated using Shannon's entropy method. Finally, the risks of explosives warehouses were determined and prioritized using the ARAS method. Results: Based on Shannon's entropy method calculations, the intensity criterion with a weight of 0.61 was assigned the most weight among the three investigated criteria. Moreover, among the various risks investigated, the use of any flame-producing devices in the warehouse (R14), non-use of special tools while opening the box of explosives (R17), and opening the boxes inside the warehouse (R7) were determined as the most important risks of explosives warehouses. Conclusion: In this study, intensity was determined as the most important criterion, and the use of any flame-producing devices in the warehouse was determined as the most important risk. The proposed method can be used as a risk assessment method to identify the risks in the warehouse of explosives.  
877 Ergonomics Investigation the Quality of Sleep and Life of Industrial Workers with Rotating Shifts Sobhani Seyvan c Tabanfar Sara d c Department of Occupational Health Engineering, Faculty of Health, Qazvin University of Medical Science, Qazvin, Iran d Department of Occupational Health Engineering, Faculty of Health, Qazvin University of Medical Science, Qazvin, Iran 1 9 2023 10 2 81 88 18 04 2023 17 06 2023 Background and Objective: Sleep is a vital need for humans. Industrial workers are among the people who suffer from insomnia and sleep problems due to their rotating shifts. This study aimed to investigate the relationship between sleep quality and the quality of life of industrial workers with rotating shifts. Materials and Methods: This descriptive-cross-sectional study was conducted on 234 industrial workers. Data were collected using a demographic information questionnaire, a short form of the World Health Organization Quality of Life Questionnaire (WHOQOL-BREF), and the Pittsburgh Sleep Quality Index (PSQI). The collected data were analyzed by Pearson correlation tests, independent t-test, and one-way analysis of variance in SPSS software (version 24). Results: The mean and standard deviation of the age of the participants was 31.6±5.7 years. The mean and standard deviation of WHOQOL-BREF and PSQI scores were 66.5±11.3 and 5.8±1.6, respectively. There was a statistically significant correlation between sleep quality and quality of life of the studied workers (r=-0.31 and P<0.001). Individuals in older age groups and more work experience had lower quality of sleep and quality of life. Moreover, females and married people experienced lower quality of sleep and quality of life, compared to males and single people, respectively. Conclusion: Insufficient sleep quality as an effective factor can decrease the quality of life of workers. Since delays in falling asleep and sleep disorders are mentioned as two factors affecting the sleep quality of workers in this research, managers and supervisors should make arrangements to optimize work shifts according to the circadian cycle with proper planning.   867 Ergonomics Evaluating the Quality of Work Life in Urban Taxi Drivers: A Case Study in Northwest Iran Rahmani Ramin e Babakhani Shakiba f Ashouri Maryam g Soltani Edris h Mamand Baboli Niya Mamand i e Department of Occupational Health Engineering, School of Public Health and Occupational Health & Safety Research Center, Hamadan University of Medical Sciences, Hamadan, Iran f Department of Ergonomics, School of Public Health, Ahvaz Jundishapour University of Medical Sciences, Ahvaz, Iran g Department of Occupational Health Engineering, School of Public Health and Safety, Shahid Beheshti University of Medical Sciences, Tehran, Iran h Student Research Committee, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran i Department of Ergonomics, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran 1 9 2023 10 2 89 98 21 02 2023 13 04 2023 Background and Objective: The Quality of Working Life (QWL) is one the most influential organizational factors, and taxi is the most common public transport system in small cities. The present study aimed to evaluate the QWL and its associated factors among urban taxi drivers. Materials and Methods: This descriptive-analytical study was performed with 176 urban taxi drivers working in one of the southern cities of West Azerbaijan province, Iran. Using the census method, individuals entered into the study considering the inclusion criteria and answered a two-part questionnaire consisting of demographic characteristics and Walton’s QWL questions. Finally, the collected data were analyzed in SPSS software (version 24). Results: The QWL evaluation showed that 18 drivers were at a low level, 151 drivers were at a moderate level, and 7 drivers were at a high level. Weak and positive correlations were observed between QWL and age and work experience. Some individual characteristics were found to be significantly associated with some aspects of QWL; however, the mean score of QWL was not significantly associated with individual characteristics, such as education level, marital status, and body mass index (BMI). Conclusion: The QWL was low and moderate in most drivers. In general, the mean score of QWL was not significantly associated with individual characteristics, such as educational level, marital status, and drivers’ BMI. Further comprehensive studies are required in this regard.   865 Ergonomics The Relationship between Job Stress and Turnover Intention and Early Retirement among Nurses: Investigating the Mediating Role of Job Satisfaction Alipour Nasim j Mahdion Seyed Ali k Asadi Fakhr Amir l Shabani Mehraneh m j Department of Anesthesiology, School of Allied Medical Sciences, Hamadan University of Medical Sciences, Hamadan, Iran. k Department of Anesthesiology, School of Allied Medical Sciences, Hamadan University of Medical Sciences, Hamadan, Iran. l Department of Anesthesiology, School of Allied Medical Sciences, Hamadan University of Medical Sciences, Hamadan, Iran. m Department of Anesthesiology, School of Allied Medical Sciences,Hamadan University of Medical Sciences, Hamadan, Iran 1 9 2023 10 2 99 106 07 02 2023 28 05 2023 Background and Objective: Job stress is an interactive situation between the job situation and the person having that job. In the effort-reward imbalance model, which is a method for measuring job stress, the imbalanced relationship between the invested efforts and the rewards received causes stressful reactions in employees, which in the long term causes physical and mental damage to the person. The present study aimed to examine the relationship between job stress and the intention to turnover and early retirement by investigating the mediating role of job satisfaction among nurses. Materials and Methods: This correlational study was conducted in 2017 through field methods and questionnaires. The study sample consisted of 455 nurses working in the governmental hospitals of Hamedan, Iran. Data collection tools included four self-report questionnaires, including job stress, intention to turnover, early retirement, and job satisfaction. Finally, after data collection, SPSS software (version 18) and AMOS23 were used for data analysis. Results: Based on the findings of the present research, a significant negative relationship was observed between effort-reward imbalance with job satisfaction and a significant positive relationship with the intention to turnover. However, no significant relationship was found between effort-reward imbalance and the intention to retire early. Additionally, although a significant negative relationship was seen between job stress and job satisfaction, there was no significant relationship between this variable and the intention to turnover the job and the intention to retire early. Conclusion: According to the obtained results, the variables used in this research, especially the variables with a mediating role, should be considered in organizational planning and policy makings to reduce occupational diseases and enhance employees’ health.   863 Ergonomics Assessment of Work Ability Status and Its Association with Fatigue and Health among Industrial Workers in Southeast Iran Mahmoodi Mohammad Hosein n Kalteh Haji Omid o Etemadi Nezhad Siavash p Hossein Nataj Abolfazl Samaei Seyed Ehsan n Department of Occupational Health Engineering, Faculty of Public Health, Mazandaran University of Medical Science, Sari, Iran o Department of Occupational Health Engineering, Faculty of Public Health, Mazandaran University of Medical Science, Sari, Iran p Department of Occupational Health Engineering, Faculty of Public Health, Mazandaran University of Medical Science, Sari, Iran Department of Biostatistics and Epidemiology, Faculty of Public Health, Mazandaran University of Medical Science, Sari, Iran Department of Occupational Health Engineering, Faculty of Public Health, Mazandaran University of Medical Science, Sari, Iran 1 9 2023 10 2 107 114 05 02 2023 15 04 2023 Background and Objective: Workforce aging is one of the problems leading to a decrease in working ability. This study aimed to evaluate the perceived work ability and its association with fatigue, as well as general and mental health in industrial workers. Materials and Methods: A total of 350 people working in various industries of Zahedan, Iran, participated in this cross-sectional study. The data were collected using the first item of the work ability index questionnaire known as work ability score (WAS), the fatigue assessment scale, as well as the general and mental health scales of the Copenhagen questionnaire. The Pearson correlation and multiple linear regression were used to analyze the data. The data were analyzed using SPSS software (version 24). Results: The mean score of the WAS among the studied subjects was 4.76±1.59, which is categorized as a poor level. According to the results of multiple linear regression analysis, fatigue, general health, and mental health had a significant effect on perceived work ability, among which the strongest relationship was related to fatigue (β=-0.324; P<0.001). The results of the study did not show a relationship between body mass index and perceived work ability (β=-0.021; P<0.05). Conclusion: According to the findings of the research, the perceived work ability was at a poor level. Fatigue and general health had the greatest effect on perceived work ability. It is suggested to design and implement studies in order to identify other factors affecting work ability.   859 Safety Modeling the Effect of Individual, Occupational, and Organizational Factors in the Occurrence of Occupational Accidents in a Gas Company Samadi Zahra Haj Agha Zade Mohammad Rahimi Bahram Ghahremani Abolfazl School of Public Health, Urmia University of Medical Sciences, Urmia, Iran Department of Occupational Health, School of Public Health, Urmia University of Medical Sciences, Urmia Iran Chief of safety and fire fighting of West Azarbaijan gas company, Urmia, Iran Department of Occupational Health, School of Public Health, Urmia University of Medical Sciences, Urmia Iran 1 9 2023 10 2 115 128 07 01 2023 28 05 2023 Background and Objective: Municipal gas is a hazardous substance with high flammability, and unsafe acts and conditions in its transmission and distribution can lead to numerous accidents. Therefore, the present study was conducted with the main aim of modeling the effect of individual, occupational, and organizational factors in the occurrence of occupational accidents in the West Azerbaijan gas company. Materials and Methods: In this cross-sectional study, a validated researcher-made questionnaire was used to identify factors influencing the occurrence of occupational accidents. A questionnaire was distributed among 500 employees of the company and a total of 379 acceptable questionnaires (79.4%) were received for analysis. The relationship between the study variables was analyzed using SPSS 14 software. Structural equation modeling (SEM) was conducted in AMOS 18 software. Results: The results of the present study showed that the mean score of the questionnaire factors was 2.84 (±0.82). Examining the scores of different factors of the questionnaire indicated that the average score of the organizational factor (3.21) was greater than that of the individual (2.53) and occupational (2.79) factors. Safety supervision and management, as one of the organizational sub-factors, had the highest importance (3.77), while risk perception, as one of the individual sub-factors, had the least importance (1.96) in creating unsafe acts and conditions. In the SEM model, the effect of the occupational factor on the individual factor (0.54) was higher than the effect of the organizational factor on the individual factor (0.24); however, different factors had no significant effect on the occurrence of occupational accidents. Conclusion: The management of the organization must control the organizational factors as the most important influencing factor with appropriate monitoring and planning. Moreover, it is possible to help prevent occupational accidents in the workplace by improving occupational and personal factors effective in creating unsafe acts and conditions.   854 Safety Assessment of Human Hazard and Performance in the Oxygen Supply System in Bu Ali Hospital in Qazvin in 2022 Shoveyri Behzad Zaroushani Vida Ghalenoei Mehran Student Research Committee, Faculty of Health, Qazvin University of Medical Sciences, Qazvin, Iran Social Determinants of Health Research Center, Research Institute for Prevention of Non-Communicable Disease, Qazvin University of Medical Sciences, Qazvin, Iran Social Determinants of Health Research Center, Research Institute for Prevention of Non-Communicable Disease, Qazvin University of Medical Sciences, Qazvin, Iran 1 9 2023 10 2 129 138 14 12 2022 20 02 2023 Background and Objective: Oxygen therapy is one of the integral parts of a hospital, which has been introduced as a therapeutic use of oxygen, and any human error in this field can cause disastrous consequences. The present study aimed to analyze the risk of the oxygen supply system of a hospital in Qazvin using the method of studying risk and human performance. Materials and Methods: In this research, firstly, study team members were selected according to the purpose of the study to benefit from their experiences in discovering the possible situations of human operation risks. According to the field visits, interviews, and existing documents, the duties of people related to the objective were analyzed by the Hierarchical Task Analysis technique. Following that, the types of errors and causes were identified, and proposed controls were presented to reduce unacceptable risks. Results: According to the 75 scenarios obtained from the used method, the results indicate that failure to perform job duties with 32.42% as the most important parameter, with the essential factors of human error, such as memory slip (38%) and heavy workload (31%), plays a role in the three categories of consequences of fire, explosion, and reduction of oxygen sent to the departments. Conclusion: This method can be used to reduce the risk of fire, explosion, and oxygen pressure sent to different units by using the techniques of improving working conditions, changing the way of training, equipping the oxygen concentration detection sensor, and using the liquid oxygen tank.   832 Safety Determining the Level of Hospital Risk in Mashhad by the Method of Safety and Occupational Health Assessment in the Hospital Ebrahimi Hossein Esmaeili Reza Asadi Hadi Department of Occupational Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran Department of Occupational Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran Department of Occupational Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran 1 9 2023 10 2 139 144 18 08 2022 31 12 2022 Background and Objective: Hospitals are one of the most important organizations in the healthcare system. Risk assessment is a tool to control risks, and risk management in hospitals is of great help in the reduction of the risk of hazards and hospital accidents. The present study aimed to evaluate the safety and health risk of hospitals using the HOSHRA (hospital occupational safety and health risk assessment) method. Materials and Methods: This cross-sectional study was conducted in 32 departments in a medical teaching hospital in Mashhad in 2022. The data were collected using the HOSHRA checklist and analyzed using the HOSHRA method formulas. Results: The highest and lowest scores pertained to ergonomic hazards (102.8) and physical agents (67.28) in the hospital. Except for the score of the ergonomics area, the scores of the physical, chemical, psychological, and biological areas were at the medium risk level, and the ergonomics area was at an acceptable level. Conclusion: The results of this study pointed out that ergonomic hazards are at an acceptable level, which requires continuous monitoring. On the other hand, chemical, ergonomic, psychological, physical, and biological risks are not acceptable at the risk level and need more revision in the future.