Risk factors for chronic obstructive pulmonary disease in never-smokers: A systematic review.

Clin Respir J · 2022 · PMC9060104 · PMID 35142054

Europe PMC DOI

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The sentences

a possible trendno p-value reported

In 2020, Conde‐Sampayo 54 conducted a systematic review of exposure to residential radon and COPD and reported a possible trend towards the existence of this association, though no definitive conclusion could be reached.

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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.