title: The Danish National Health Service Register.
abstract: BACKGROUND
  To describe the Danish National Health Service Register in relation to research.
  
  
  BACKGROUND
  The register contains data collected for administrative and scientific purposes from health contractors in primary health care. It includes information about citizens, providers, and health services but minimal clinical information.
  
  
  RESULTS
  The register covers everyone living in Denmark and data is available from 1990. No validity studies have been reported. Because the data is connected to reimbursement the coverage is assumed to be good.
  
  
  CONCLUSIONS
  The strengths of the register include completeness, size, and long follow-up period. It is useful for research purposes but reservations must be made regarding its validity.
authors.affiliation: Section of General Practice, Department of Public Health, University of Copenhagen, Denmark. sal@sund.ku.dk
authors.forename: John Sahl
authors.initials: JS
authors.lastname: Andersen
authors.forename: Niels De Fine
authors.initials: Nde F
authors.lastname: Olivarius
authors.forename: Allan
authors.initials: A
authors.lastname: Krasnik
mesh_terms: D003718:Denmark; D058006:General Practice / Q000458:organization & administration; D006302:Health Services Research; D006801:Humans; D009313:National Health Programs; D011320:Primary Health Care / Q000458:organization & administration; D012042:Registries / Q000592:standards