A pilot study of the impact of high-frequency chest wall oscillation in chronic obstructive pulmonary disease patients with mucus hypersecretion.

Int J Chron Obstruct Pulmon Dis · 2011 · PMC3257955 · PMID 22259246

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showed a trendno p-value reported

Sputum expectoration remained individually variable but showed a trend toward a reduction after HFCWO.

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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.