title: An algorithm to differentiate diabetic respondents in the Canadian Community Health Survey.
abstract: OBJECTIVE
  This article describes an algorithm to classify respondents to cycle 1.1 (2000/2001) of the Canadian Community Health Survey (CCHS) according to whether they have type 1, type 2 or gestational diabetes.
  
  
  METHODS
  The data are from the chronic disease module and the drug module of cycle 1.1 of the CCHS.
  
  
  METHODS
  A total of 6,361 respondents to cycle 1.1 of the CCHS reported that a health care professional had diagnosed them as having diabetes. The Ng-Dasgupta-Johnson algorithm classifies this group according to whether they have type 1, type 2 or gestational diabetes, based on their answers to CCHS questions about diabetes during pregnancy, use of oral medications to control diabetes, use of insulin, timing of initiation of insulin treatment, and age at diagnosis.
  
  
  RESULTS
  Application of an earlier algorithm to CCHS cycle 1.1 results in a 10%-90% split for type 1 and type 2 diabetes. By contrast, the Ng-Dasgupta-Johnson algorithm yields a 5%-95% split. This is not unreasonable, given the rapid rise in obesity, a major risk factor for type 2 diabetes, in Canada.
authors.affiliation: Health Information and Research Division at Statistics Canada in Ottawa, Ontario K1A 0T6. Edward.Ng@statcan.ca
authors.forename: Edward
authors.initials: E
authors.lastname: Ng
authors.forename: Kaberi
authors.initials: K
authors.lastname: Dasgupta
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Johnson
mesh_terms: D000328:Adult; D000367:Age Factors; D000465:Algorithms; D002170:Canada; D003663:Decision Trees; D003920:Diabetes Mellitus / Q000145:classification* / Q000175:diagnosis / Q000188:drug therapy / Q000503:physiopathology; D005260:Female; D006306:Health Surveys; D006801:Humans; D007004:Hypoglycemic Agents / Q000627:therapeutic use; D007328:Insulin / Q000627:therapeutic use; D008297:Male; D011247:Pregnancy
chemical_list: D007004:Hypoglycemic Agents; D007328:Insulin