The contribution of symptoms and comorbidities to the economic impact of COPD: an analysis of the German COSYCONET cohort.

Int J Chron Obstruct Pulmon Dis · 2017 · PMC5720349 · PMID 29270005

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did not reach statistical significanceno p-value reported

The level of dyspnea, GOLD stage, and the interaction terms did not reach statistical significance.

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