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Socio-Demographic and Geographical Factors in Esophageal and Gastric Cancer Mortality in Sweden

Author

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  • Rickard Ljung
  • Sven Drefahl
  • Gunnar Andersson
  • Jesper Lagergren

Abstract

Background: Socio-demographic factors and area of residence might influence the development of esophageal and gastric cancer. Large-scale population-based research can determine the role of such factors. Methods: This population-based cohort study included all Swedish residents aged 30–84 years in 1990–2007. Educational level, marital status, place of birth, and place of residence were evaluated with regard to mortality from esophageal or gastric cancer. Cox regression yielded hazard ratios (HR) with 95% confidence intervals (CI), adjusted for potential confounding. Results: Among 84 920 565 person-years, 5125 and 12 230 deaths occurred from esophageal cancer and gastric cancer, respectively. Higher educational level decreased the HR of esophageal cancer (HR = 0.61, 95%CI 0.42–0.90 in women, HR = 0.71, 95%CI 0.60–0.84 in men) and gastric cancer (HR = 0.80, 95%CI 0.63–1.03 in women, HR = 0.73, 95%CI 0.64–0.83 in men). Being unmarried increased HR of esophageal cancer (HR = 1.64, 95%CI 1.35–1.99 in women, HR = 1.64, 95%CI 1.50–1.80 in men), but not of gastric cancer. Being born in low density populated areas increased HR of gastric cancer (HR = 1.23, 95%CI 1.10–1.38 in women, HR = 1.37, 95%CI 1.25–1.50 in men), while no strong association was found with esophageal cancer. Living in densely populated areas increased HR of esophageal cancer (HR = 1.31, 95%CI 1.14–1.50 in women, HR = 1.40, 95%CI 1.29–1.51 in men), but not of gastric cancer. Conclusion: These socio-demographic inequalities in cancer mortality warrant efforts to investigate possible preventable mechanisms and to promote and support healthier lifestyles among deprived groups.

Suggested Citation

  • Rickard Ljung & Sven Drefahl & Gunnar Andersson & Jesper Lagergren, 2013. "Socio-Demographic and Geographical Factors in Esophageal and Gastric Cancer Mortality in Sweden," PLOS ONE, Public Library of Science, vol. 8(4), pages 1-6, April.
    • Handle: RePEc:plo:pone00:0062067
    DOI: 10.1371/journal.pone.0062067
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