Validation of a method to assess emphysema severity by spirometry in the COPDGene study.

Respir Res · 2020 · PMC7195744 · PMID 32357885

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a slight trendno p-value reported

For those classified at CT as ME we observed an increase of the percentage of cases from ESI 0 to 2–3, then a slight trend to reduction.

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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.