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Table 1 Demographics, Health Plan Enrollment, and Illness Burden

From: Healthcare costs and utilization for Medicare beneficiaries with Alzheimer's

  AD Cohort Control Group
  N = 25,109 N = 75,327
Characteristic   
Age, Mean (SD)* 80.1 (6.5) 80.1 (6.6)
Age, n (%)   
   65 – 69 1,529 (6.1) 4,613 (6.1)
   70 – 74 3,482 (13.9) 10,330 (13.7)
   75 – 79 6,345 (25.6) 19,641 (26.1)
   80 – 84 7,326 (29.2) 21,471 (28.5)
   85 – 89 4,654 (18.5) 13,428 (17.8)
   90+ 1,683 (6.7) 5,844 (7.8)
Female, N (%) 15,473 (61.6) 47,082 (62.5)
Regional distribution, N (%)   
   Northeast 2,986 (11.9) 10,783 (14.3)
   North Central 8,710 (34.7) 25,725 (34.2)
   South 9,178 (36.6) 24,028 (31.9)
   West 4,185 (16.7) 14,534 (19.3)
   Unknown 50 (0.2) 257 (0.3)
Months of health plan enrollment in 2004, Mean (SD) 11.1 (2.51) 11.2 (2.34)
Enrolled all 12 months of 2004, N (%) 21,380 (85.2) 65,949 (87.6)
Number of Comorbidities, Mean (SD)†§ 8.1 (5.5) 6.5 (5.0)
Illness burden score, Mean (SD)ठ1.23 (0.80) 1.04 (0.77)
  1. * Age as of 01 Jan 2003 displayed as mean ± standard deviation (SD)
  2. † Diagnostic Cost Group (DCG) Condition Categories (CCs), excluding AD.
  3. ‡ Prospective Relative Risk Score (RRS) excluding AD, normalized to 1.0 for the eligible study population.
  4. § Statistically significant differences between the two groups at p < 0.001.