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    Association between shiftwork and the risk of colorectal cancer in females: a population-based case-control study.

    Access Status
    Fulltext not available
    Authors
    Walasa, W.
    Carey, R.
    Si, S.
    Fritschi, Lin
    Heyworth, J.
    Fernandez, R.
    Boyle, T.
    Date
    2018
    Type
    Journal Article
    
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    Citation
    Walasa, W. and Carey, R. and Si, S. and Fritschi, L. and Heyworth, J. and Fernandez, R. and Boyle, T. 2018. Association between shiftwork and the risk of colorectal cancer in females: a population-based case-control study.. Occup Environ Med.
    Source Title
    Occup Environ Med
    DOI
    10.1136/oemed-2017-104657
    ISSN
    1470-7926
    School
    School of Public Health
    URI
    http://hdl.handle.net/20.500.11937/66332
    Collection
    • Curtin Research Publications
    Abstract

    OBJECTIVE: Research indicates that shiftwork may be associated with increased risks of adverse health outcomes, including some cancers. However, the evidence of an association between shiftwork and colorectal cancer risk is limited and inconclusive. Further, while several possible pathways through which shiftwork might result in cancer have been proposed, few studies have taken these factors into account. We investigated the association between two types of shiftwork (graveyard shiftwork and early-morning shiftwork) and six mechanistic shiftwork variables (including light at night and phase shift) and the risk of colorectal cancer among females in an Australian population-based case-control study. Graveyard shiftwork was the primary exposure of interest. METHODS: Participants (350 cases and 410 controls) completed a lifetime occupational history, and exposure to each of the eight shiftwork variables was assigned to participants through a job exposure matrix. We used logistic regression to calculate odds ratios (OR) and corresponding 95% confidence intervals (CI) for the association between different shiftwork variables and the risk of colorectal cancer, adjusting for potential demographic, lifestyle and medical confounders. RESULTS: Working in an occupation involving long-term exposure (>7.5 years) to graveyard shiftwork was not associated with colorectal cancer risk (adjusted OR 0.95, 95% CI 0.57 to 1.58). Similarly, no increased risks of colorectal cancer were seen for any of the other seven shiftwork variables examined. CONCLUSIONS: No evidence of an increased risk of colorectal cancer among females who had worked in occupations involving shiftwork was observed in this study.

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