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Table 1 Characteristics of the study population

From: Post-trauma morbidity, measured as sick leave, is substantial and influenced by factors unrelated to injury: a retrospective matched observational cohort study

  Trauma patients Controls P value*
Number of individuals 4712 25,013  
Age, years    0.025
 20–29 1557 (33.0) 7862 (31.4)  
 30–44 1667 (35.4) 8790 (35.1)  
 45–63 1488 (31.6) 8361 (33.4)  
Gender    0.494
 Female 1318 (28.0) 7119 (28.5)  
 Male 3394 (72.0) 17,894 (71.5)  
History of comorbidity    
 Psychiatric 523 (11.1) 1024 (4.1) < 0.001
 Substance abuse 609 (12.9) 617 (2.5) < 0.001
 Somatic 734 (15.6) 3116 (12.5) < 0.001
Education    < 0.001
 High 1200 (25.5) 9738 (38.9)  
 Medium 2293 (48.7) 11,416 (45.6)  
 Low 1105 (23.5) 3261 (13.0)  
 Missing 114 (2.4) 598 (2.4)  
Sick leave month one before trauma, days/month    < 0.001
 None 4440 (94.2) 24,320 (97.2)  
 Part 187 (4.0) 495 (2.0)  
 Full 85 (1.8) 198 (0.8)  
Sick leave month twelve after trauma, days/month    < 0.001
 None 3747 (79.5) 24,239 (96.9)  
 Part 326 (6.9) 418 (1.7)  
 Full 495 (10.5) 334 (1.3)  
 Dead 144 (3.1) 22 (0.1)  
Mechanism of injury
 Traffic-related 2752 (58.4)   
 Fall 1032 (21.9)   
 Assault 604 (12.8)   
 Self-inflicted 134 (2.8)   
 Other 188 (4.0)   
 Missing 2 (0.0)   
Type of trauma
Penetrating 317 (6.7)   
Blunt 4395 (93.3)   
ISS
 Median (IQR) 5 (1–13)   
 ≤ 15 3716 (78.9)   
  > 15 996 (21.1)   
GCS on arrival    
 14–15 3985 (84.6)   
 9–13 313 (6.6)   
 3–8 414 (8.8)   
AIS > 2
 Head 769 (16.3)   
 Spine 217 (4.6)   
SAP on arrival, mm Hg
 ≥ 90 4584 (97.3)   
  < 90 128 (2.7)   
Length of stay hospital, days
 0–7 3756 (79.7)   
  > 7 956 (20.3)   
Discharge destination
 Home 3745 (79.5)   
 Other hospital/rehab 967 (20.5)   
  1. Values in parentheses are percentages unless indicated otherwise
  2. ISS Injury Severity Score, GCS Glasgow Coma Scale, AIS Abbreviated Injury Scale, SAP Systolic Arterial Pressure, mm Hg Millimeters of mercury
  3. *χ2-test