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Shift workers' mortality scrutinized.

Anders Knutsson1, Niklas Hammar, Berndt Karlsson

  • 1Department of Nursing and Health Sciences, Mid Sweden University, Sundsvall, Sweden. knutsson@mh.se

Chronobiology International
|January 14, 2005
PubMed
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Shift work may increase mortality risk, particularly for former shift workers and those aged 45-54. This study re-analyzed historical data to assess the long-term health impacts of occupational shift schedules.

Area of Science:

  • Occupational health
  • Epidemiology
  • Mortality studies

Background:

  • Shift work is common in many industries and has been linked to various health issues.
  • Previous studies have suggested potential associations between shift work and increased mortality.
  • Reappraising existing data is crucial for understanding long-term health risks.

Purpose of the Study:

  • To re-evaluate published mortality data for male shift workers.
  • To compare mortality rates of current and former shift workers against day workers.
  • To identify specific age groups or worker categories with elevated mortality risks.

Main Methods:

  • Utilized the Mantel-Haenszel method for calculating mortality rate ratios.
  • Compared mortality data for three groups: current shift workers, ex-shift workers, and combined shift/ex-shift workers, against day workers.

Related Experiment Videos

  • Conducted age-specific analyses to pinpoint vulnerable age demographics.

    • Main Results:

    • Overall mortality risk for current and former shift workers combined was 1.05 (95% CI: 0.95-1.16).
    • Ex-shift workers showed a significantly increased mortality risk (1.24, 95% CI: 1.03-1.51) compared to day workers.
    • Increased mortality was observed in shift workers aged 45-54 (RR: 1.47, 95% CI: 1.12-1.93).

    Conclusions:

    • Shift work appears to be associated with an increased risk of mortality.
    • Former shift workers and those in the 45-54 age group face higher mortality risks.
    • Further research into the mechanisms and long-term consequences of shift work is warranted.