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This is a graphic illustration of the mean change in actual FEV1 in mL between patients with reversibility and those without. The blue column represents the magnitude of change in actual FEV1 among each group, and it shows that patients with irreversibility had almost no change in actual FEV1. The bold red line represents the difference in actual FEV1 between both groups. FEV1: forced expiratory volume in the first second.
