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Studies of silicosis among migrant workers (report 1). The frequent occurrence and relevant factors of silicosis.

Nakagawa H; Yamada Y; Okumura Y; Morikawa Y; Tabata M; Kawano S
Proceedings of the VIIth International Pneumoconioses Conference, August 23-26, 1988, Pittsburgh, Pennsylvania, USA. Atlanta, GA: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 90-108, 1990 Nov; (Part II):1387-1394
The statistical facts and the fate of silicosis patients were determined for all male workers in five areas of the Eastern Toyama Prefecture. Questionnaires were completed by 2,260 individuals, 931 of whom had worked as migrant workers. Of the 931, 645 men had been exposed to dust while working in tunnel construction. Chest roentgenography was used to examine 566 of these men. In 477 of them, 84% were diagnosed with silicosis. These 477 cases included 248 with category-I disease, 122 cases of category-II disease, 54 cases of category-III disease, and 53 cases of category-IV silicosis. In 322 of these cases the disease condition was first diagnosed during this study, the workers having returned to their homes following job completion without having been given any diagnosis or medical care at their places of employment. The authors state that poor working and living conditions for these workers during the construction of the tunnel are important social factors which cause the frequent occurrence of silicosis among these workers. The absence of medical examinations, lack of proper worker education, and the failure to wear respirators while engaged in dust generating activities also contribute to the large number of silicosis cases.
Dust exposure; Airborne dusts; Dust inhalation; Cancer rates; Mortality surveys; Mortality data; Respiratory system disorders; Epidemiology; Tunneling; Tunnel workers
Publication Date
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Conference/Symposia Proceedings
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Identifying No.
DHHS (NIOSH) Publication No. 90-108
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Proceedings of the VIIth International Pneumoconioses Conference, August 23-26, 1988, Pittsburgh, Pennsylvania, USA
Page last reviewed: June 15, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division