Effects of Aging and Smoking Duration on Cigarette Smoke-Induced COPD Severity.

J Korean Med Sci · 2019 · PMC6434146 · PMID 30923493

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highly significantno p-value reported

The combined effect of smoking duration and age were found highly significant among subjects over 20 years aged smoking group for COPD severity ( Table 3 ).

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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.