The resultsshowed: (1) There was no significant diffe-rence in VC/VC_(pr), FEV_(1.0)%, MVV/MVV_(pr),V_(50)/H, V_(25)/H and the rates of abnormal anddoubtful abnormal small airway function(SAF) between two groups.

• 结果表明:(1)两组VC/VC_(PR)、FEV_(1.；0)%25、MVV/MVV_(PR)、V_(50)/H、V_(25)/H、小气道功能异常率及可疑异常率均无显著性差异。