出稼ぎ経験者にみられた珪肺有所見者に関する研究 : (第一報) 珪肺有所見者の実態調査

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The purpose of this study is to investigate the prevalence of and to classify the types of silicosis patients who were working at that time as migrant workers*) in the eastern part of Toyama Prefecture.Questionaires were sent to all male inhabitants aged 30 or over in the selected area. Eighty-eight percent of the questionaires were answered and returned. Based on the results, 246 inhabitants were selected as migrant workers with experience in jobs where they were exposed to large amounts of dust. Chest roentgenography and subjective symptoms were examined in these subjects.The results obtained were follows;(1) Five hundred and six of the respondents (36%) had worked as migrant workers. Of these, 333 men (66%) had worked in jobs with exposure to dust. Of this number, 296 (89%) had worked in tunnels.(2) The prevalence of respiratory disease symptoms was greater for men who had worked in jobs with exposure to dust than for those who were not migrant workers and whose jobs did not expose them to dust.(3) Of the 246 migrant workers whose jobs exposed them to dust, 195 silicosis cases (79%) were found by chest roentgenographic examination. Silicosis is classified into four types according to the national Pneumoconiosis Law on the basis of chest roentgenographic findings. These patients included 77 cases of type 1, 65 cases of type 2, 38 cases of type 3 and 15 cases of type 4 silicosis.(4) The prevalence of disease symptoms in the silicosis patients included; cough 43%, phlegm 41%, shortness of breath 43%, palpitations 15% and wheezing in 19% of the cases. The silicosis patients showed a higher frequency of respiratory disease symptoms than those dust-exposed workers who did not evidence signs of silicosis.(5) The silicosis patients were found in 96% of the migrant workers whose exposure to dust lasted a period of more than 20 years, 84% in men whose work was between 10 and 19 years and 62% in men who had worked less than 10 years.(6) The silicosis in 141 cases (72% of the total number of disease patients) was first detected during the examinations in the course of this research.*) Migrant workers are known in japanese as “dekasegi”. This term refers to workers who migrate seasonally from thier home towns to areas where work is more available.
日本衛生学会の論文

著者

中川秀昭
金沢医科大学

出稼ぎ経験者にみられた珪肺有所見者に関する研究 : (第一報) 珪肺有所見者の実態調査

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