1. Distribution of patients in the first- or second-year follow-up according to the number of acute exacerbations of chronic obstructive pulmonary disease presented and their severity (full cohort, year 1 or year 2).
Distribution of patients in the first- or second-year follow-up according to the number of acute exacerbations of chronic obstructive pulmonary disease presented and their severity (full cohort, year 1 or year 2). The “any” category indicates overall classification; patients could experience exacerbations in one or more severity category.
Tom M.A. Wilkinson et al. ERJ Open Res 2019;5:
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