炭鉱の珪肺および珪肺結核の結果

Abstract

Course of illness of 909 miners with silicosis and 143 silicotic miners covered by the Workmen's Compensation Law was observed from 1952 to 1959, 5 to 6 years for each patient. The results are as follows. If silicosis is graded as S0, S1, S2, S3 and S4, with increasing severity, S0-1, are found among workers in employment over 3 years below ground, S1 and the above are among those in employment over 5 years underground, and most silicotic miners covered by the Law are found among those in employment of 7 to 9 years underground. According to the film examination, aggravated cases are found 7.1% in S0-1, 22.5% in S2, and 88.2% in S3. Among these aggravated cases infiltration images are found in 97.6%. Socalled unusually large which has big significance in the aggravation of silicosis is found in 21.1% of S1, 73.5% of S2. The development of this nodulation shows almost no difference among workers of different kinds of work, except significutly low incidencer among coal collectors. However, aggravated cases are found among workers in decreasing degree in such order as: coal-face workers, indirect workers, and collectors. Cases of direct workers, infiltration are mostly of tuberculosis nature, and some of them are due to conglomeration of silicotic modules.