Analysis of Factors Affecting Safety Outcomes in Construction Projects: A Field Study in One of the Large Construction Projects in Iran

Background: In addition to detrimental effects on economy and people, safety consequences could negatively affect the efficiency and productivity of construction projects. This study aims to analyze the factors affecting safety consequences in construction projects. Method: This was a descriptive-analytical and cross-sectional study conducted in 2020 in a large construction project (a sewage treatment plant) in Tehran. The 250 people working in this construction project participated in this study. Data for this study were collected based on a safety parameter assessment checklist. Independent variables in this study were age and work experience, education, daily working hours, harmful physical and ergonomic factors, and unsafe practices. Analytical variables included Accident Frequency Rate (AFR) and Safe-T score. A multiple linear regression model and SPSS version 22.0 were used for data analysis. Results: Age and working experience of the participants were 35.8± 9.8 and 3.4± 1.7, respectively, and nearly half of them had high school diploma (47.6%). AFR for two consecutive years of 2019 and 2020, were 5.16 and 4.43 accidents, respectively. Safe-T-Score was calculated as – 0.011. The results of regression analysis revealed a significant relation (p<0.05) between Safe-T-score and working experience, daily working hours, unsafe practices, noise and thermal stress exposure, carrying and moving loads, and safety risk factors variables. Conclusion: Results of this study indicated that although safety performance at the studied construction site was relatively favorable, several variables had an impact on the safety consequences of the project. Hence, the safety consequences of construction projects might benefit from the results of this study.