en Occupational and Industrial Health Occupational and Industrial Health پژوهشي Original Article <div style="text-align: justify;"><span style="font-size:14px;"><span style="font-family:times new roman;"><strong>Background:</strong> Several factors contribute to accidents in small-scale construction projects (SSCPs). The present study aimed to assess the influential factors in SSCP accidents and introduce a model to predict their frequency.<br> <strong>Methods:</strong> In total, 38 SSCPs were within the scope of this investigation. The safety index of accident frequency rate (AFR) causing 452 injury construction accidents during 12 years (2007-2018) was analyzed and modeled. Data analysis was performed based on feature selection using Pearson&#39;s &chi;² coefficient and SPSS modeler, as well as the artificial neural networks (ANNs) in MATLAB software.<br> <strong>Results:</strong> Mean AFR was estimated at 26.32 &plusmn; 14.83, and the results of both approaches revealed that individual factors, organizational factors, training factors, and risk management-related factors could predict the AFR involved in SSCPs.<br> <strong>Conclusion:</strong> The findings of this research could be reliably applied in the decision-making regarding safety and health construction issues. Furthermore, Pearson&#39;s correlation-coefficient and ANN modeling are considered to be reliable tools for accident modeling in SSCPs.</span></span></div> Construction Projects,Accident,Modeling 121 126 http://jhehp.zums.ac.ir/browse.php?a_code=A-10-275-1&slc_lang=en&sid=1 Behrouz Alizadeh Savareh behrouzalizadeh@gmail.com 10031947532846009738 10031947532846009738 No Department of Medical Informatics, School of Management and Medical Education, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Mohsen Mahdinia mohsen.mahdinia@yahoo.com 10031947532846009739 10031947532846009739 No Department of Occupational Safety & Health Engineering, Health School and Research Center for Environmental Pollutants, Qom University of Medical Sciences, Qom, Iran. Samira Ghiyasi s.ghiasi@iauctb.ac.ir 10031947532846009740 10031947532846009740 No Department of Environmental Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran. Jamshid Rahimi rahimij@gmail.com 10031947532846009741 10031947532846009741 No Department of Occupational Safety & Health Engineering, Health School, Alborz University of Medical Sciences, Karaj, Iran. Ahmad Soltanzadeh soltanzadeh.ahmad@gmail.com 10031947532846009742 0000000269761276 Yes Department of Occupational Safety & Health Engineering, Health School and Research Center for Environmental Pollutants, Qom University of Medical Sciences, Qom, Iran.