Serum surfactant protein D during acute exacerbations of chronic obstructive pulmonary disease.

Dis Markers · 2009 · PMC3834666 · PMID 20075511

Europe PMC DOI

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failed to reach statistical significanceno p-value reported

[14], serum SP-D levels were slightly increased in smokers compared to non smoker controls but the differences failed to reach statistical significance.

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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.