Major air pollutants and risk of COPD exacerbations: a systematic review and meta-analysis.

Int J Chron Obstruct Pulmon Dis · 2016 · PMC5161337 · PMID 28003742

Europe PMC DOI

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borderline significanceno p-value reported

The property subgroups of case-crossover study and COPD deaths had borderline significance.

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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.