A study to assess the utility of forced expiratory volume in 1 second/forced expiratory volume in 6 seconds in diagnosing obstructive airway disease
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According to the Global Initiative for Chronic Obstructive Lung Disease criteria, the ratio of forced expiratory volume in the 1st second (FEV1) and forced vital capacity (FVC) is required to diagnose chronic obstructive pulmonary disease. However, it becomes ... ...
