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Decreased COPD prevalence in Sweden after decades of decrease in smoking.

Helena Backman1, Lowie Vanfleteren2, Anne Lindberg3

  • 1Department of Public Health and Clinical Medicine, Section of Sustainable Health/the OLIN Unit, Umeå University, Umeå, Sweden. helena.backman@norrbotten.se.

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Summary
This summary is machine-generated.

COPD prevalence has decreased in Sweden, particularly moderate to severe cases. This decline is linked to reduced smoking rates, though smoking remains the primary risk factor for chronic obstructive pulmonary disease.

Keywords:
COPDEpidemiologyPopulation studyPrevalenceRisk

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Area of Science:

  • Pulmonary Medicine
  • Epidemiology
  • Public Health

Background:

  • COPD prevalence increased globally until the early 2000s.
  • Recent European studies suggest a leveling or decrease in COPD prevalence.
  • Sweden has observed a significant decline in smoking rates since the 1970s.

Purpose of the Study:

  • To determine COPD prevalence, characteristics, and risk factors in the Swedish general population.
  • To analyze the COPD prevalence trend in Northern Sweden between 1994 and 2009.

Main Methods:

  • Two large random population samples (n=1839) underwent spirometry and interviews (2009-2012).
  • Northern Sweden data was compared to a 15-year-older study in the same region.
  • COPD diagnosis required chronic airway obstruction (CAO) and respiratory symptoms, using GOLD criteria (FEV1/FVC < 0.70 or LLN).

Main Results:

  • COPD prevalence was 7.0% (men 8.3%, women 5.8%) using the fixed ratio definition.
  • Moderate to severe COPD (GOLD ≥ 2) prevalence was 3.5%; LLN criteria yielded ~30% lower results.
  • Smoking, occupational exposures, and age were COPD risk factors, with smoking being dominant. Moderate to severe COPD decreased significantly in Northern Sweden from 1994-2009, correlating with reduced smoking.

Conclusions:

  • COPD prevalence has declined in Sweden, with notably low rates of moderate to severe disease.
  • This decrease aligns with decades of reduced smoking prevalence.
  • Despite the decline, smoking persists as the leading risk factor for COPD in Sweden.