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Changes in closing capacity measured by the single-breath nitrogen washout test in the two study groups.
Note: The improvement is greater in the extra-fine beclomethasone-formoterol combination group than in the non-extra-fine fluticasone propionate-formoterol group.
Abbreviations: CC/TLC, closing capacity/total lung capacity; FP/S, fluticasone propionate/salmeterol; BDP/F, beclomethasone dipropionate/formoterol.
