1. These person-years multiplied by the national mortality rates produced the expected number of deaths for each cause of death in each subgroup. 95% Confidence intervals (95% CIs) were calculated with the method proposed by Breslow and Day.'5 As the cohort was compiled by means of the medical dossiers from the respiratory health examination in the 1950s, only person-years were included since that medical examination,1992
2. Coal workers' pneumoconiosis and pneumnoconiosis due to other carbonaceous dusts. In: Church A Green FHY. eds. Pathology of occupational lung disease;Green, F.H.Y.,1988
3. Abnormal secretion of interleukin-1 and tumor necrosis actor a bv alveolar macrophages in coal workers pneumoconiosis;P, Lasalle P.Gosset; C, Aerts;Exj Lung Res,1990
4. Biological markers and occupational lung dis ease: mineral dust-induced respiratory disorders. Exp Lung Res 1994; 20: 457-70 4 International Agency for Research on Cancer. Monographs on the evaluation of carcinogenic risk to humans. Lyon 1ARC WHO;Borm, P.J.A.;Environ Healtti Res; Health effects of coal mining and combustion, carcinogens and cofactors,1987
5. Dust exposure, pneumoconiosis. and mortality of coalminers;Miller, B.G.; Jacobsen, M.;Br 7 Ind Med,1985