Solid Fuel Use and Incident COPD in Chinese Adults: Findings from the China Kadoorie Biobank.

Environ Health Perspect · 2019 · PMC6790542 · PMID 31095433

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a positive trendno p-value reported

We observed a positive trend between COPD and the duration of exposure to heating with solid fuels prior to baseline.

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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.