title: The Supplementary Pension Fund Register.
abstract: BACKGROUND
  Information on individual long-term work history is often required in occupational studies of diseases.
  
  
  BACKGROUND
  The Supplementary Pension Fund Register has kept individual information on all employments, including start and end, on a company level backdating to 1964 for all wage earners in Denmark. Based on the computerised information, which also includes the unique personal identification number, it is possible to link information on employment history to information on individuals in nationwide registers of diseases.
  
  
  RESULTS
  Membership is compulsory and controlled by the Danish authorities, therefore information is considered to be accurate and complete.
  
  
  CONCLUSIONS
  This register is unique and of high value in occupational epidemiology.
authors.affiliation: Institute of Cancer Epidemiology, Danish Cancer Society, Strandboulevarden 49, DK-2100 Copenhagen, Denmark. johnni@cancer.dk
authors.forename: Johnni
authors.initials: J
authors.lastname: Hansen
authors.forename: Christina Funch
authors.initials: CF
authors.lastname: Lassen
mesh_terms: D003718:Denmark; D004651:Employment / Q000145:classification; D004812:Epidemiologic Methods; D006801:Humans; D016273:Occupational Exposure / Q000009:adverse effects; D010415:Pensions; D012042:Registries / Q000592:standards