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Health Risk or Resource? Gradual and Independent Association between Self-Rated Health and Mortality Persists Over 30 Years

Author

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  • Matthias Bopp
  • Julia Braun
  • Felix Gutzwiller
  • David Faeh
  • for the Swiss National Cohort Study Group

Abstract

Background: Poor self-rated health (SRH) is associated with increased mortality. However, most studies only adjust for few health risk factors and/or do not analyse whether this association is consistent also for intermediate categories of SRH and for follow-up periods exceeding 5–10 years. This study examined whether the SRH-mortality association remained significant 30 years after assessment when adjusting for a wide range of known clinical, behavioural and socio-demographic risk factors. Methods: We followed-up 8,251 men and women aged ≥16 years who participated 1977–79 in a community based health study and were anonymously linked with the Swiss National Cohort (SNC) until the end of 2008. Covariates were measured at baseline and included education, marital status, smoking, medical history, medication, blood glucose and pressure. Results: 92.8% of the original study participants could be linked to a census, mortality or emigration record of the SNC. Loss to follow-up 1980–2000 was 5.8%. Even after 30 years of follow-up and after adjustment for all covariates, the association between SRH and all-cause mortality remained strong and estimates almost linearly increased from “excellent” (reference: hazard ratio, HR 1) to “good” (men: HR 1.07 95% confidence interval 0.92–1.24, women: 1.22, 1.01–1.46) to “fair” (1.41, 1.18–1.68; 1.39, 1.14–1.70) to “poor”(1.61, 1.15–2.25; 1.49, 1.07–2.06) to “very poor” (2.85, 1.25–6.51; 1.30, 0.18–9.35). Persons answering the SRH question with “don't know” (1.87, 1.21–2.88; 1.26, 0.87–1.83) had also an increased mortality risk; this was pronounced in men and in the first years of follow-up. Conclusions: SRH is a strong and “dose-dependent” predictor of mortality. The association was largely independent from covariates and remained significant after decades. This suggests that SRH provides relevant and sustained health information beyond classical risk factors or medical history and reflects salutogenetic rather than pathogenetic pathways.

Suggested Citation

  • Matthias Bopp & Julia Braun & Felix Gutzwiller & David Faeh & for the Swiss National Cohort Study Group, 2012. "Health Risk or Resource? Gradual and Independent Association between Self-Rated Health and Mortality Persists Over 30 Years," PLOS ONE, Public Library of Science, vol. 7(2), pages 1-10, February.
  • Handle: RePEc:plo:pone00:0030795
    DOI: 10.1371/journal.pone.0030795
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    References listed on IDEAS

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    1. Olli Pietiläinen & Mikko Laaksonen & Ossi Rahkonen & Eero Lahelma, 2011. "Self-Rated Health as a Predictor of Disability Retirement – The Contribution of Ill-Health and Working Conditions," PLOS ONE, Public Library of Science, vol. 6(9), pages 1-7, September.
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