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Comparison of baseline pulmonary function parameters according to chronic obstructive pulmonary disease severity
(FEV1: a forced expiration volume in 1 s; FVC: forced vital capacity; PEF: peak expiratory flow; FEF25–75: forced expiratory flow between 25% and 75% of vital capacity; GOLD: Global Initiative for Chronic Obstructive Lung Disease; CAT: chronic obstructive lung disease assessment test)
