Plasma N-terminal pro-brain natriuretic peptide: a prognostic marker in patients with chronic obstructive pulmonary disease.

Lung · 2012 · PMC3339052 · PMID 22246552

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did not reach statistical significanceno p-value reported

However, because only seven patients had stage IV COPD, the difference of NT-proBNP between stage III and stage IV did not reach statistical significance most likely because of a lack of statistical power, not because of an actual lack of difference.

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