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Longitudinal stability of the bronchodilator reversible phenotype. The number of subjects (y-axis, number label) with reversible (red bars) and non-reversible (blue bars) phenotypes for response to bronchodilator, based on cut-off of change in FEV1 of 12 % and 200 ml, at the indicated visit (x-axis) are shown for subjects that were reversible (a) or non-reversible (b) at the screening visit, stratified by asthma severity cohort
