Studies of Silicosis among Migrant Workers (Report 2). Mortality among Migrant Workers for Tunnelling Works.
Yamada-Y; Nakagawa-H; Okumura-Y; Morikawa-Y; Tabata-M; Kawano-S
NIOSH 1990 Nov:1381-1386
A questionnaire survey was conducted on the male population over 30 years of age residing in the eastern Toyama prefecture for an epidemiological study of silicosis during the summer of 1977 and 1978. The purpose was to determine the effects of exposure to dust generated during tunnel construction. Replies were obtained from 2260 individuals. The mortality rate per 1,000 person years of migrant workers who had worked in jobs with exposure to the dust was 23.0, significantly higher than that of migrant workers who had not been exposed to dust (15.5) which was higher than the mortality rate for nonmigrant workers whose jobs did not expose them to the dust (9.5). The mortality rate was particularly high in migrant workers exposed to dust who were in the age group from 50 to 79. The highest mortality rate among those workers exposed to the dust was associated with malignant neoplasms, 5.4; pulmonary tuberculosis, 4.9; pneumoconiosis, 4.0; heart disease, 3.6; and cerebrovascular diseases, 2.2. Pulmonary tuberculosis and pneumoconiosis occurred in migrant workers exposed to dust to a significantly greater extent than in exposed nonmigrant workers.
Dust-exposure; Airborne-dusts; Dust-inhalation; Cancer-rates; Mortality-surveys; Mortality-data; Respiratory-system-disorders; Epidemiology; Tunneling; Tunnel-workers;
Infectious Diseases; Disease and Injury; Asthma and Chronic Obstructive Pulmonary Disease; Respiratory-system-disorders;
Proceedings of the VIIth International Pneumoconioses Conference