Pulmonary Functio Tests on the Appraisal of the Disability of Silicotic Patients

1)　151 caser of silicosis were measred by vital capacity, maximum breathing capacity, timed vital capacity, oxygen diffusing capacity, ar—terial blood oxygen saturation.

2)　Categoly 1 of simple silicosis are almost normal in pulmonary function tests, Categoly 2 and Categoly 3 have decreased lung volume and impaired ventilatory funtion. Some of the Categoly 3 have decrased arterial oxygen saturation.

3)　The disability of silicosis could not be deter—mined by single test.

4)　The normal limit adopted in Kyushu Ladour Accident Hospital were illustrated.