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Forced expiratory volume in one second (FEV 1 ) is widely used in grading the severity of the airflow limitation observed in chronic obstructive pulmonary disease (COPD). However, the characteristics of COPD classified by forced vital capacity (FVC) remain unknown. Hence, the characteristics of pulmonary function test (PFT) and clinical features of COPD patients classified by FVC were investigated.

A specific subtype of chronic obstructive pulmonary disease classified by forced vital capacity