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Table 1 Number of patients diagnosed with diabetes (true positives between linked health administrative-EMR dataset) and associated crude prevalence rates categorized by diabetes definition

From: Investigating concordance in diabetes diagnosis between primary care charts (electronic medical records) and health administrative data: a retrospective cohort study

Definition # Patients with Diabetes Crude Prevalence %
1. Base Definition: ≥2 plasma glucose tests a OR insulin OR ≥2 oral anti-diabetic drugs 975 5.0
   a. Base OR HbA1c ≥6.5% 1515 7.8
   b. Base OR diabetes on problem list 1905 9.8
   c. Base OR HbA1c ≥6.5% OR diabetes on problem list 2180 11.2
   d. Base OR HbA1c ≥6.5% OR diabetes on problem list; Limit base definition to ≥1 oral anti-diabetic drugs 2329 12.0
   e. Base OR HbA1c ≥6.5% OR diabetes on problem list; Limit base definition to ≥1 oral anti-diabetic drugs OR ≥1 plasma glucose tests 2329 12.0
2. Registry: ≥2- ICD 250 codes AND ≥1 HbA1c lab value 1586 8.2
3. ODD: one hospitalization discharge with a diagnostic code for diabetes (ICD9 250) OR two physician service claims with a diagnosis recorded for diabetes (ICD8 250) within a 2-year period 1935 10.0
  1. aPlasma glucose tests include: fasting plasma glucose ≥ 7.0 mmol/L; casual plasma glucose ≥ 11.1 mmol/L; 2-hour plasma glucose in a 75-g oral glucose tolerance test ≥ 11.1 mmol/L