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Table 1 Prevalence of Diabetes amongst Adults ages 65 and older in Three National Samples

From: Identifying diabetics in Medicare claims and survey data: implications for health services research

  NHANES Linked HRS/A1c Linked HRS/Medicare Linked HRS/Medicare/A1c
Self-report 19.1% (16.6-21.6) 21.3% (19.8-22.8) 21.7% (20.4-23.0) 21.2% (19.2-23.2)
Hemoglobin A1c ≥ 6.5 12.2% (10.1-14.3) 13.0% (11.8-14.1) -- 12.6% (10.7-14.4)
Undiagnosed 3.8% (1.8-5.7) 4.2% (3.3-5.2) -- 4.4% (3.2-5.6)
Self-report + undiagnosed 22.9% 25.5% -- 25.6%
Medicare claims -- -- 28.7% (27.1-30.2) 27.3% (25.3-29.2)
Sample size 1,066 3,817 6,101 2,028
  1. Parenthetical entries are 95% confidence intervals.
  2. Undiagnosed diabetes refers to the percentage of cases who self-reported not ever receiving a diabetes diagnosis but met the clinical threshold for diabetes (Ha1c ≥ 6.5).
  3. Sources: 2006 Health and Retirement Study (HRS); 2006 Medicare Beneficiary Annual Summary File; 2005–2006 National Health and Nutrition Examination Survey (NHANES).