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Table 1 Characteristics of the study population according to surgical procedures

From: Impact of age and comorbidity burden on mortality and major complications in older adults undergoing orthopaedic surgery: an analysis using the Japanese diagnosis procedure combination database

  Overall Cervical laminoplasty Lumbar decompression Lumbar arthrodesis Total knee arthroplasty p
(n = 107,104) (n = 16,020) (n = 31,605) (n = 18,419) (n = 41,060)
Age, years; mean [SD] 70.1 [10.7] 66.2 [11.6] 68.9 [11.3] 65.7 [12.1] 74.6 [6.9] < 0.001
  ≤ 64 25,927 (24.2) 6,534 (40.8) 8,898 (28.2) 6,976 (37.9) 3,519 (8.6)  
  65–79 63,838 (59.0) 7,678 (47.9) 18,166 (57.5) 10,060 (54.6) 27,394 (68.0)  
  ≥ 80 17,339 (16.2) 1,808 (11.3) 4,541 (14.4) 1,383 (7.5) 9,607 (23.4)  
Sex       
  Men 45,044 (42.1) 11,050 (69.0) 18,735 (59.3) 8,456 (45.9) 6,803 (16.6) < 0.001
  Women 62,060 (57.9) 4,970 (31.0) 12,870 (40.7) 9,963 (54.1) 34,257 (83.4)  
Charlson comorbidity index       
  0 68,931 (64.4) 9,518 (59.4) 20,234(64.0) 11,971 (65.0) 27,208 (66.3) < 0.001
  1 24,068 (22.5) 3,481 (21.7) 7,060(22.3) 3,825 (20.8) 9,702 (23.6)  
  2 9,656 (9.0) 1,885 (11.8) 2,928(9.3) 1,747 (9.5) 3,096 (7.5)  
  ≥ 3 4,449 (4.2) 1,136 (7.1) 1,383(4.4) 876 (4.8) 1,054 (2.6)  
Postoperative length of stay, day, median [IQR] 21 [15–30] 18 [14–26] 15[1221] 20 [15–28] 27 [21–36] < 0.001
  1. SD standard deviation, IQR interquartile range.