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. 2020 Feb 12;15:323–334. doi: 10.2147/COPD.S235106

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© 2020 Melbye et al.

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Prevalence of moderate to severe COPD^a by age^b in three Tromsø Study surveys.^c

Notes: ^aModerate to severe COPD is defined as FEV₁/FVC <LLN combined with FEV₁ <LLN in subjects reporting dyspnoea or cough. ^bP<0.001 in all three surveys. ^cThe statistical significance of change between the surveys is shown in Table 1.