title: Surveillance data on US coal miners' pneumoconiosis, 1970 to 1986.
abstract: OBJECTIVE
  Statistics on prevalence of pneumoconiosis among working underground coal miners from data collected as part of a large national radiographic surveillance program between 1970 and 1986 are presented. The main intent was to examine the time-related trend in prevalence over this period, which coincides with historically low dust levels mandated by federal act.
  
  
  METHODS
  Tenure-specific prevalence rates and summary statistics derived from them for four consecutive time intervals within the 16-year period were calculated and compared.
  
  
  RESULTS
  The results indicate a reduction in pneumoconiosis over the life of the program. This trend is similar to that seen in epidemiologic studies undertaken concurrently.
  
  
  CONCLUSIONS
  Although low participation in the surveillance program and other problems complicate the findings, it appears that reductions in dust exposure mandated by federal act in 1969 have led to lower prevalence of pneumoconiosis among underground coal miners.
authors.affiliation: Division of Respiratory Disease Studies, National Institute for Occupational Safety and Health, Morgantown, WV 26505.
authors.forename: M D
authors.initials: MD
authors.lastname: Attfield
authors.forename: R B
authors.initials: RB
authors.lastname: Althouse
mesh_terms: D015982:Bias; D002985:Clinical Protocols / Q000592:standards; D003032:Coal Mining; D006801:Humans; D008452:Maximum Allowable Concentration; D009313:National Health Programs / Q000331:legislation & jurisprudence / Q000592:standards*; D009314:National Institute for Occupational Safety and Health, U.S.; D016272:Occupational Health / Q000331:legislation & jurisprudence; D011009:Pneumoconiosis / Q000000981:diagnostic imaging / Q000453:epidemiology* / Q000517:prevention & control; D011159:Population Surveillance; D015995:Prevalence; D011322:Primary Prevention / Q000331:legislation & jurisprudence / Q000592:standards; D013902:Radiography, Thoracic / Q000145:classification / Q000592:standards; D014481:United States / Q000453:epidemiology