title: Prevalence of bile duct cancer among printing industry workers in comparison with other industries.
abstract: OBJECTIVE
  The aim of this study was to assess the risk of developing bile duct cancer among workers in the other printing industry in comparison with workers in all industries in general.
  
  
  METHODS
  Prevalence of bile duct cancer was compared between workers in the printing industry and age-standardized controls in all other industries using the claims database of the Japan Health Insurance Association, which insures workers of small-medium sized employers of all industries.
  
  
  RESULTS
  Young (aged 30-49) male workers in the printing industry showed an elevated but insignificant standardized prevalence rate ratio (SPRR) for bile duct cancer in comparison with workers in all other industries (SPRR: 1.78; 95%CI: 0.63-5.00). The risk was higher for intrahepatic bile duct cancer but remained insignificant (SPRR: 3.03; 95%CI: 0.52-17.56).
  
  
  CONCLUSIONS
  The sharply elevated risk of bile duct cancer observed among proof-printing workers of a printing factory in Osaka may not be generalizable to workers in the printing industry nationwide.
authors.affiliation: National Institute of Public Health, Department of Health and Welfare Service Research.
authors.forename: Etsuji
authors.initials: E
authors.lastname: Okamoto
authors.forename: Kiyotaka
authors.initials: K
authors.lastname: Kikuchi
authors.forename: Ginji
authors.initials: G
authors.lastname: Endo
mesh_terms: D000328:Adult; D001650:Bile Duct Neoplasms / Q000453:epidemiology*; D002277:Carcinoma / Q000453:epidemiology; D016001:Confidence Intervals; D005260:Female; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008297:Male; D009784:Occupational Diseases / Q000453:epidemiology*; D016273:Occupational Exposure / Q000706:statistics & numerical data*; D009790:Occupations; D016017:Odds Ratio; D015995:Prevalence; D011327:Printing; D012042:Registries