Comparison of clinical features between non-smokers with COPD and smokers with COPD: a retrospective observational study.

Int J Chron Obstruct Pulmon Dis · 2014 · PMC3890400 · PMID 24426780

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showed a trendno p-value reported

Non-smokers with COPD showed a trend towards less severe shortness of breath than smokers with COPD.

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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.