Prevalence of airway obstruction in the elderly: Results from a cross-sectional spirometric study of nine age cohorts between the ages of 60 and 93 years

Abstract

Aims: To study the prevalence of airway obstruction according to age, gender and smoking habits using spirometry, and to compare the results using different definitions, classifications and spirometric reference values in an elderly population. Methods: A random sample of 2046 men and women in nine age cohorts (aged 60, 66, 72, 78, 81, 84, 87, 90 and 93 years) were drawn from the Swedish municipality registers. 1092 subjects performed spirometry of which 574 met ATS spirometric criteria. Results: According to GOLD criteria (FEV1/FVC <0.7) the prevalence of obstruction was 22.5% regardless of which one of three different spirometric reference values were used. Using the recently-changed Swedish National Guideline (SNG) recommendations - an FEV1/(F)VC ratio<0.7 in subjects younger than 65 years but an FEV1/(F)VC ratio<0.65 in subjects 65 years or older in order to define airway obstruction-the prevalence was 14.1% regardless of the applied spirometric reference values. Using the criterion FEV1/(F)VC