Prevalence of chronic obstructive pulmonary disease and variation in risk factors across four geographically diverse resource-limited settings in Peru.

Respir Res · 2015 · PMC4389577 · PMID 25889777

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marginally significantno p-value reported

Smoking for at least 10 pack-years was associated with COPD in males, and was marginally significant in females.

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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.