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Table 1 Baseline characteristics of the study population, total and surgery applied

From: An analysis of equity in treatment of hip fractures for older patients with dementia in acute care hospitals: observational study using nationwide hospital claims data in Japan

  Total sample (%) Surgery applied (%)
  (n = 214,601) (n = 159,173)
Individual factor
 Sex
  Male 47,456 (22.1) 34,904 (21.9)
  Female 167,145 (77.9) 124,269 (78.1)
 Age Group
  65–79 57,608 (26.8) 44,528 (28.0)
  80–89 105,505 (49.2) 78,333 (49.2)
  Over 90 51,488 (24.0) 36,312 (22.8)
 Dementia Levela
  0 111,414 (51.9) 84,424 (53.0)
  1 58,400 (27.2) 42,187 (26.5)
  2 44,787 (20.9) 32,562 (20.5)
 Fructure Type
  Femoral neck 115,753 (53.9) 88,243 (55.4)
  Trochanteric 95,946 (44.7) 69,229 (43.5)
  Subtrochanteric 2900 (1.4) 1701 (1.1)
 Charlson Index
  0 94,182 (43.9) 68,173 (42.8)
  1 67,259 (31.3) 51,625 (32.4)
   ≥ 2 53,160 (24.8) 39,375 (24.7)
 Coma Levelb
  Alert 183,672 (85.6) 136,161 (85.5)
  Level 1 29,890 (13.9) 22,301 (14.0)
  Level 2 966 (0.5) 668 (0.4)
  Level 3 73 (0.03) 43 (0.03)
 Ambulance use
  No ambulance use 103,136 (48.1) 68,992 (43.3)
  Ambulance use 111,465 (51.9) 90,181 (56.7)
Hospital factor
 City levelc
  Designated city 62,667 (29.2) 47,388 (29.8)
  Population ≥ 150,000 70,862 (33.0) 54,353 (34.2)
  Population 80,000≤, ≤150,000 39,173 (18.3) 29,661 (18.6)
  Population ≤ 80,000 41,899 (19.5) 27,771 (17.5)
 Hospital functiond
  University & advanced hospitals 5288 (2.5) 4263 (2.7)
  Regional support hospital 52,802 (24.6) 44,825 (28.2)
  Over 200 beds hospital 117,215 (54.6) 91,272 (57.3)
  Under 200 beds hospital 39,296 (18.3) 18,813 (11.8)
Length of stay factor
 Discharge to
  Home 58,673 (27.3) 32,873 (20.7)
  Recovery ward (same hosp.) 6318 (2.9) 3255 (2.04)
  Other hospital 108,323 (50.5) 93,681 (58.9)
  Long-term care facility 38,337 (17.9) 27,584 (17.3)
  Death 2679 (1.3) 1605 (1.0)
  Unknown 264 (0.1) 168 (0.1)
  1. aDementia level 1 and 2: represents “degree of independence in daily life for elderly people with dementia” criteria I-II and III-IV/M, respectively. bComa level refers to the Japan Coma Scale (JCS) which has four decisive levels of consciousness. cDesignated city has population over 500,000 and is designated by order of the Cabinet of Japan under Local Autonomy Law. dAdvanced hospitals include 6 national centers for cancer, circulation and global health. Regional support hospital has over 200 beds and meets requirements such as referral rate over 80% for outpatients