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Increased injuries on night shift

L Smith1, S Folkard, C J Poole

  • 1Department of Psychology, University of Wales Swansea, UK.

Lancet (London, England)
|October 22, 1994
PubMed
Summary
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Night shifts increase injury risk, particularly for self-paced work. This study analyzed 4645 injury incidents in an engineering company, finding higher accident rates during night shifts compared to morning shifts.

Area of Science:

  • Occupational Health
  • Industrial Safety
  • Ergonomics

Background:

  • Regulatory bodies, like the European Union Commission, have enacted legislation to limit night work hours due to safety concerns.
  • However, direct empirical evidence linking night work to increased injury frequency has been limited.

Purpose of the Study:

  • To investigate the relationship between shift work, specifically night shifts, and the incidence of workplace injuries.
  • To determine if the type of work (machine-paced vs. self-paced) influences injury risk during different shifts.

Main Methods:

  • Analysis of 4645 injury incidents over one year in a large engineering company operating on a rotating three-shift system.
  • Comparison of injury incidence rates across morning, evening, and night shifts, controlling for a priori constant accident risk.

Related Experiment Videos

  • Stratification of analysis based on work type: machine-paced versus self-paced.

    • Main Results:

    • A statistically significant increase in the relative risk of sustaining an injury was observed during the night shift (1.23; 95% CI 1.14-1.31) compared to the morning shift.
    • The morning shift exhibited the lowest injury incidence.
    • For self-paced work, the relative risk of more serious injury was substantially higher on the night shift (1.82; 95% CI 1.30-2.34) compared to the morning shift.

    Conclusions:

    • Night shift work is associated with a higher risk of workplace injuries.
    • The risk of serious injury during night shifts is particularly elevated in self-paced work environments.
    • Findings support the need for targeted safety interventions for night shift workers, especially those engaged in self-paced tasks.