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Mean changes in the total St George's Respiratory Questionnaire (SGRQ) total and domain scores over 12 months in those individuals with baseline total SGRQ scores of >50 points. a) SGRQ total score; b) SGRQ symptoms score; c) SGRQ impacts score; d) SGRQ activity score. MCID: minimal clinically important difference. *: p<0.05 compared to baseline.
