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Table 2 Concordance in diagnoses for Medicare and work-life claims (Sample 2)

From: Linking individual medicare health claims data with work-life claims and other administrative data

  Hypertension Diabetes Heart Disease Arthritis Asthma Depression
Dxs Prior to Age 65 44 % 19 % 18 % 26 % 9 % 3 %
 Using 2 ICD-9 Diagnosis Codes
  Prior Dxs Confirmed at 65 68 % 78 % 57 % 29 % 39 % 11 %
  Prior Dxs Confirmed by 66 81 % 88 % 68 % 41 % 45 % 20 %
  New Dxs Seen at 65–66 22 % 10 % 8 % 14 % 6 % 3 %
  Kappa age 64 and 65–66 0.57 0.36 0.65 0.32 0.18 0.21
  Kappa rating Moderate Fair Substantial Fair Slight Fair
 Using all ICD-9 Diagnosis Codes
  Prior Dxs Confirmed at 65 80 % 89 % 67 % 38 % 47 % 20 %
  Prior Dxs Confirmed by 66 89 % 94 % 78 % 52 % 58 % 34 %
  New Dxs Seen at 65–66 27 % 11 % 10 % 20 % 9 % 5 %
  Kappa age 64 and 65–66 0.52 0.35 0.61 0.35 0.15 0.21
  Kappa rating 80 % 89 % 67 % 38 % 47 % 20 %
  1. All current and former hourly workers on Medicare with any health history were included in this sample (Sample 1). Sensitivity and specificity are considered using two ICD-9 codes as compared with all of the ICD-9 codes provided in the Medicare data