title: Validation of diagnostic codes for Charcot-Marie-Tooth disease in the Danish National Patient Registry.
abstract: OBJECTIVE
  To validate the diagnostic codes for Charcot-Marie-Tooth disease (CMT) in the Danish National Patient Registry (DNPR) using positive predictive value (PPV) as a measure of validity.
  
  
  METHODS
  We used the DNPR to identify all patients diagnosed with at least one primary CMT diagnosis at a specialized department in the Central Denmark Region during the period 1977-2012. From this population, we randomly selected 123 patients for the validation study. Medical files were reviewed and used as reference standard. We estimated the PPV of the CMT diagnoses and stratified the analysis according to age at diagnosis, gender, and calendar time.
  
  
  RESULTS
  In the DNPR, 275 patients were identified. We were able to retrieve 96 medical files from the random sample of 123 patients, and 85 CMT diagnoses were confirmed. The average age at diagnosis was 42.5 years, and 34% were female. The PPV was 88.5% (95% confidence interval: 80.4-94.1).
  
  
  CONCLUSIONS
  The CMT diagnoses in the DNPR have high validity. The DNPR can be used as a data source for epidemiologic research on CMT.
authors.affiliation: Department of Clinical Genetics, Aarhus University Hospital, Aarhus N.
authors.forename: Signe
authors.initials: S
authors.lastname: Vaeth
authors.affiliation: Department of Clinical Genetics, Aarhus University Hospital, Aarhus N.
authors.forename: Uffe Birk
authors.initials: UB
authors.lastname: Jensen
authors.affiliation: Department of Clinical Genetics, Aarhus University Hospital, Aarhus N.
authors.forename: Rikke
authors.initials: R
authors.lastname: Christensen
authors.affiliation: Department of Neurology, Aarhus University Hospital, Aarhus C, Denmark.
authors.forename: Henning
authors.initials: H
authors.lastname: Andersen
keywords: International Classification of Disease codes; epidemiology; positive predictive value; registries