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Change in forced expiratory volume in 1 s (FEV1) with time for patients with cystic fibrosis who had at least one sputum culture positive for Achromobacter xylosoxidans (Ax+) and cystic fibrosis patients uninfected by A. xylosoxidans (Ax−). Data are presented as the mean±sd of FEV1 recorded in the preceding year.
