Breast Cancer and Night Work among Norwegian Nurses

Jan 18, 2006Cancer causes & control : CCC

Breast cancer and working night shifts among Norwegian nurses

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Abstract

The adjusted odds ratio of breast cancer for nurses with 30 or more years of night work is 2.21 compared to those who did not work nights.

  • A case-control study was conducted involving 44,835 Norwegian nurses educated between 1914 and 1980.
  • 537 breast cancer cases were identified, with four controls matched for each case by year of birth.
  • Statistical analysis showed a significant association between long-term night work and increased breast cancer risk.
  • The p-value for the trend in breast cancer risk with increased years of night work was 0.01.
  • Findings align with previous research suggesting a link between night work and breast cancer risk in women.

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