Frequent sputum production is associated with disturbed night's rest and impaired sleep quality in patients with COPD.

Sleep Breath · 2015 · PMC4662951 · PMID 25737300

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hedged sentence

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moderately significantno p-value reported

Our results showed that sleep quality was weakly to moderately significant associated with quality of life.

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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.