Research output per year
Research output per year
Anna Johnsson, Per Broberg, Anders Johnsson, Åsa B. Tornberg, Håkan Olsson
Research output: Contribution to journal › Article › peer-review
Background: Epidemiological studies have indicated that physical activity reduces the risk of developing breast cancer. More recently, sedentary behavior has been suggested as a risk factor independent of physical activity level. The purpose of the present study was to investigate occupational sedentariness and breast cancer risk in pre- and postmenopausal women. Materials and methods: In a population-based prospective cohort study (n = 29 524), working history was assessed by a questionnaire between 1990 and 1992. Participants were classified as having: (1) sedentary occupations only; (2) mixed occupations or (3) non-sedentary occupations only. The association between occupational sedentariness and breast cancer incidence was analyzed by Cox regression, adjusted for known risk factors and participation in competitive sports. Results: Women with a working history of occupational sedentariness had a significantly increased risk of breast cancer (adjusted HR 1.20; 95% CI 1.05, 1.37) compared with those with mixed or non-sedentary occupations. The association was stronger among women younger than 55 years (adjusted HR 1.54; 95% CI 1.20, 1.96), whereas no association was seen in women 55 years or older. Adjustment for participation in competitive sports did not change the association. Conclusions: We found that occupational sedentariness was associated with increased breast cancer risk, especially in women younger than 55 years. This may be a modifiable risk factor by planning breaks during the working day. Whether this reduces the risk of breast cancer needs to be further studied.
Original language | English |
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Pages (from-to) | 75-80 |
Number of pages | 6 |
Journal | Acta Oncologica |
Volume | 56 |
Issue number | 1 |
Early online date | 2016 Dec 5 |
DOIs | |
Publication status | Published - 2017 |
Research output: Thesis › Doctoral Thesis (compilation)
Olsson, H. (Assistant supervisor), Tornberg, Å. (Supervisor), Broberg, P. (Assistant supervisor), Johnsson, A. (Research student) & Johnsson, A. (Researcher)
2013/12/01 → 2020/09/18
Project: Research