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ORIGINAL ARTICLE
Year : 2015  |  Volume : 3  |  Issue : 3  |  Page : 156-162

Investigating the occupational accident rate in Mines and Industries due to change in official time in Iran, a month before and after the spring and summer changes


1 Clinical Tuberculosis and Epidemiology Research Center, Tehran, Iran
2 Lung Transplantation Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran; Research Institute of ShakhesPajouh, Isfahan, Iran
3 Faculty of Environment University of Tehran, Tehran, Iran

Correspondence Address:
Elham Ghazanchaei
Research Institute of Shakhes Pajouh, Isfahan
Iran
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2347-9019.157389

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Introduction: A quarter of the world's population experience one-hour change of time twice a year (due to daylight saving time or DST). Disruptions in the circadian rhythm may have harmful impacts on health. Circadian rhythm disruptions caused by changed biological clock lead to a change in sleep quality and length, which might result in accidents due to fatigue, headache, and loss of care and consciousness. Through transitions into and out of DST plan, the environmental and social clock change biannually. According to the review of literature, transition into and out of DST plan disrupts balance in circadian rhythm and may lead to sleep disruptions. Therefore, the aim of this study is to explore the effect of DST plan on the occupational accidents experienced by the workers in Mines and Mining Industries Development and Renovation of Organization in the months before and after DST transition. Materials and Methods: In this survey, using the databank of Iran's Organization for Development and Renovation of Mines and Mining Industries, we analyzed all occupational accidents during 9 years, from 2003 to 2011 in the months before (21 st February-20 th March and 23 rd August-22 nd September) and after DST (21 st March-21 st April and 23 rd September-23 rd October). Moreover, the year 2006 in which DST was not implemented in Iran was compared with other years. Results: The results yielded through statistical tests suggested that the number of occupational accidents had no significant increase in the months before and after DST during these 9 years, and there was no significant difference between 2006, when DST did not occur in Iran, and other years (P > 0.05). Conclusion: The study findings reveal that DST experienced by the workers at industrial factories, the risk of accidents and that of occurrence of severe occupational accidents do not significantly increase.


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