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Table 2 Demographic characteristics of the breast cancer and non-cancer patient cohorts

From: Misclassification of incident conditions using claims data: impact of varying the period used to exclude pre-existing disease

   Breast cancer Non-cancer
Characteristic   patients patients
  N = 33,731 (%) N = 101,649 (%)
Age (years) a ≤ 70 5,498 (16.3) 27,783 (27.3)
  71-75 9,618 (28.5) 29,883 (29.4)
  76-80 8,903 (26.4) 24,098 (23.7)
  > 80 9,712 (28.8) 19,885 (19.6)
Race/ethnicity White 29,487 (87.4) 85,329 (83.9)
  Black 2,173 (6.4) 7,483 (7.4)
  Asian/Other 1,016 (3.0) 6,317 (6.2)
  Hispanic 1,055 (3.1) 2,520 (2.5)
SEER Region c Georgia (Atlanta/Rural Georgia) 1,009 (3.0) 3,575 (3.5)
  California b 10,533 (31.2) 30,910 (30.4)
  Connecticut 2,121 (6.3) 6,380 (6.3)
  Hawaii 442 (1.3) 1,712 (1.7)
  Iowa 2,397 (7.1) 7,172 (7.1)
  Kentucky 2,889 (8.6) 8,680 (8.5)
  Louisiana 2,355 (7.0) 6,920 (6.8)
  Michigan (Detroit) 2,638 (7.8) 8,029 (7.9)
  New Jersey 5,950 (17.6) 15,961 (15.7)
  New Mexico 717 (2.1) 2,751 (2.7)
  Utah 851 (2.5) 3,006 (3.0)
  Washington (Seattle/Puget Sound) 1,829 (5.4) 4,665 (4.6)
NCI Comorbidity score d 0 27,193 (80.6) 76,804 (75.6)
  1 3,965 (11.8) 18,087 (17.8)
  ≥2 2,573 (7.6) 6,758 (6.6)
Year of diagnosis 2000 11,433 (33.9) N/A
  2001 11,432 (33.9)  
  2002 10,866 (32.2)  
  1. aAge at diagnosis index date.
  2. bCalifornia includes Los Angeles, San Francisco/Oakland, San Jose/Monterey, and Greater California.
  3. c1,888 non-cancer patients had no region reported.
  4. dComorbidity index based on conditions identified in the 12 months prior to the diagnosis index date.