Factors Associated with Chronic Obstructive Pulmonary Diseases in Nepal: Evidence from a Nationally Representative Population-Based Study.

Int J Chron Obstruct Pulmon Dis · 2021 · PMC8068482 · PMID 33907397

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a positive trendno p-value reported

38 As found and supported in other studies 29 , 30 , 39 there was also a positive trend with the increase of cigarette packs per year, confirming smoking as a significant risk factor for the development of COPD.

also in 11,005 other papers

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.