No change in prevalence of symptoms of COPD between 1996 and 2006 in Finnish adults - a report from the FinEsS Helsinki Study.

Eur Clin Respir J · 2016 · PMC4989180 · PMID 27534614

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a decreasing trendno p-value reported

The prevalence of current smoking continued on a decreasing trend compared to both our 1996 survey and the results from the nationwide Health 2000 study ( 12 , 38 ).

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.