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Lung function indices progression.
Notes: Baseline (0) and scheduled visits (every 6 months) during 2 years of follow-up; values are expressed as the mean ± one standard error. (⋄) indicates infrequent exacerbators; (■) indicates frequent exacerbators.
Abbreviations: IC, inspiratory capacity; FVC, forced vital capacity; FEV1, forced expiratory volume in 1 second; pred, predicted.
