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Correlation with COPD Assessment Test (CAT) and with St. George Respiratory Questionnaire (SGRQ). (A) CAT scores and SGRQ symptoms scores. (B) CAT scores and SGRQ activity scores. (C) CAT scores and SGRQ impacts scores. (D) CAT scores and SGRQ total scores. COPD: chronic obstructive pulmonary disease.
