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The relationship between the annual change in postbronchodilator FeV1.
Note: The annual change in SGRQ total score is negatively correlated with the annual change in FEV1 (r=−0.27, P<0.001, n=261).
Abbreviations: FEV1, forced expiratory volume in 1 second; SGRQ, St George’s Respiratory Questionnaire.
