Article
Clinical COPD phenotypes identified by cluster analysis: validation with mortality
31 Jul 2012
Abstract excerpt
To the Editors: Because forced expiratory volume in 1 s is a poor descriptor of chronic obstructive pulmonary disease (COPD) heterogeneity [1], interest has emerged regarding the identification of clinically relevant COPD phenotypes [2, 3]. We recently reported the usefulness of applying mathematical models ( i.e. principal component and cluster analyses) to multiple variables for the identification of clinical...
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