Methods According to their FEV 1.0 values, 200 silicosis cases were divided into 4 groupss:normal, slight, medium and severe, and their values of plethysmographical airway resistance were measured.

• 方法 选择进行过有关测定的矽肺患者200 例，以第1 秒用力呼气量的分度值分为正常、轻度、中度、重度组观察各组体描法气道阻力测定项目的变化。