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Adjusted associations of continuous hemoglobin with selected outcomes of interest. (A) Total CAT score; (B) number of severe exacerbations in the past year; (C) 6-minute walk distance; (D) SGRQ. Dotted lines indicate 10th and 90th percentiles for hemoglobin distribution, and the dashed line indicates the median for hemoglobin distribution. CAT = COPD Assessment Test; SGRQ = St. George’s Respiratory Questionnaire.
