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Forced expiratory volume (FEV)1 versus age (in years) from seven representative patients with data taken from the Cystic Fibrosis Foundation Patient Registry. Each set of points connected by a line represents observed FEV1 over age for an individual patient. Trajectories in red represent individuals who had a pulmonary exacerbation, while trajectories in black represent individuals who were pulmonary exacerbation free during the observation period.
