Epidemiological evidence relating environmental smoke to COPD in lifelong non-smokers: a systematic review.

F1000Res · 2018 · PMC6953425 · PMID 32089819

Europe PMC DOI

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marginally significantno p-value reported

In addition, five studies presented a total of seven OR estimates for severer COPD, with five estimates above 1.00 (one significantly so and one marginally significant) and two non-significantly below 1.00.

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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.