title: [Analysis on the tendency of practical dust exposure year and the out-of-dust rate among coalminers].
abstract: It is important to study the practical dust exposure year and out-of-dust rate for the evaluation of dust level and to predict pneumoconiosis incidence in coal miners. A Retrospective Cohort Study was carried out on the calculation of practical dust exposure year and the out-of-dust rate among coal miners employed during 1958-1988 in a mine. The results showed that job variety had a strong effect on dust exposure year and that out-of-dust rate beared relationship to the years of employment. It can be estimated that the percentage of coalminers who were employed in 1975-1979 with dust exposure year reached 20 years would be less than 30%, and that those being employed after 1980 would be even lesser.
authors.affiliation: Beijing Municipal Sanitation and Disease Prevention Center.
authors.forename: S F
authors.initials: SF
authors.lastname: Jiao
authors.forename: N
authors.initials: N
authors.lastname: Guo
authors.forename: R L
authors.initials: RL
authors.lastname: Yao
mesh_terms: D000328:Adult; D003032:Coal Mining; D015331:Cohort Studies; D004391:Dust; D006801:Humans; D015994:Incidence; D015993:Life Tables; D008297:Male; D008875:Middle Aged; D016273:Occupational Exposure; D011009:Pneumoconiosis / Q000453:epidemiology*; D012189:Retrospective Studies
chemical_list: D004391:Dust