The second group included 32 early stage silicotic patients wit hout any treatment before.The first group was divided into four subgroups:high d osage,low dosage,stop-treatment and control.

• “九五”攻关课题“联合用药治疗矽肺效果及综合评价方法研究”(简称“九五”)中新选早期矽肺病例32人，分为大剂量组和对照组。