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Safety incidents associated with extended working hours

A systematic review and meta-analysis


Authors: Dagfinn Matre , Marit Skogstad, Tom Sterud, Karl-Christian Nordy, Stein Knardahl, Jan Olav Christensen, Jenny-Anne S Lie


Objective: We performed a systematic review to assess potential consequences of extended working hours on accidents, near-accidents, safety incidents and injuries (incidents) by considering the overall certainty of evidence.

Methods: We searched five databases systematically (Medline, Embase, PsycINFO, Web of Science, and Proquest Health and safety Science Abstract) and identified 10072 studies published until December 2020. Twenty-two studies met the inclusion criteria. We followed a systematic approach to evaluate risk of bias and synthesize results in a meta-analysis. The certainty of evidence was determined by a modified version of The Grading of Recommendations Assessment, Development and Evaluation (GRADE).

Results: Our analyses indicated an association between working >12 hours/day (RR: 1.24, 95%CI: 1.11, 1.40), or working >55 hours/week (RR: 1.24, 95%CI: 0.98, 1.57), and elevated risk of incidents. The certainty of evidence evaluated as low. Weak or no associations were observed for other exposure contrasts: working >8 hours/day (RR: 0.93, 95%CI: 0.72, 1.19), or working overtime (RR: 1.08, 95%CI: 0.75, 1.55), working 41-48 hours/week (RR: 1.02, 95%CI: 0.92, 1.13) or 49-54 hours/week (RR: 1.02, 95%CI: 0.97, 1.07). The certainty of evidence was evaluated as low (very low for 41-48 hours/week).

Conclusions: Daily working hours >12 hours and weekly working hours exceeding 55 hours was associated and increased risk of incidents. The level of evidence was low. Hence, further high-quality research is warranted to elucidate these associations.

This article is a trending article in the field of Occupational and Environmental Medicine. The abstract above was written by the author(s) below. This study was conducted by the author(s) below and published in the journal or book below.


Authors: agfinn Matre , Marit Skogstad, Tom Sterud, Karl-Christian Nordy, Stein Knardahl, Jan Olav Christensen, Jenny-Anne S Lie

Journal: Scandinavian journal of work, environment & health

Link 1: this article @ Pubmed

Link 2: this article @ Scandinavian journal of work, environment & health