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Table 1 Descriptive characteristics of the study population (N = 30,042a)

From: The associations of multimorbidity with the sum of annual medical and long-term care expenditures in Japan

  n (%)
Charlson Comorbidity Indexb
 0 13,732 (45.7%)
 1 3167 (10.5%)
 2 7199 (24.0%)
 3 2254 (7.5%)
 4 1942 (6.5%)
 5 787 (2.6%)
 6 540 (1.8%)
 7 216 (0.7%)
 8 106 (0.4%)
 9 52 (0.2%)
 ≥10 47 (0.2%)
Birth year (ages as of January 1, 2012)
 1900–1914 (97–111) 162 (0.5%)
 1915–1919 (92–96) 862 (2.9%)
 1920–1924 (87–91) 2769 (9.2%)
 1925–1929 (82–86) 6201 (20.6%)
 1930–1934 (77–81) 11,137 (37.1%)
 1935–1939 (72–76)c 8911 (29.7%)
Sex
 Men 12,561 (41.8%)
 Women 17,481 (58.2%)
Household income level (n = 29,915)
 Low-income group 8823 (29.5%)
 Middle-to-high income group 21,092 (70.5%)
Level of long-term care required
 Not required 22,657 (75.4%)
 Support level 1 586 (2.0%)
 Support level 2 787 (2.6%)
 Care level 1 1574 (5.2%)
 Care level 2 1558 (5.2%)
 Care level 3 1143 (3.8%)
 Care level 4 918 (3.1%)
 Care level 5 819 (2.7%)
  1. aUnless otherwise specified
  2. bThe 2011 updated and reweighted version
  3. cWe included only those individuals who were enrolled in the Late-Stage Medical Care System for the Elderly (i.e., adults ≥75 years) in this analysis