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Table 1 Baseline characteristics of the study population

From: Hyperoxemia and long-term outcome after traumatic brain injury

  All patients (n = 1,116) Hypoxemia (n = 174) Normoxemia (n = 375) Hyperoxemia (n = 567) P-value
Age, years 53 (35, 64) 53 (34, 63) 55 (41, 66) 52 (32, 64) 0.020
Year of admission      
 2002 to 2007 461 (41) 83 (48) 179 (48) 199 (35) <0.001
 2008 to 2012 655 (59) 19 (52) 196 (52) 368 (65)  
Emergency operation 576 (52) 87 (50) 187 (50) 302 (53) 0.515
Operative admission 632 (57) 82 (47) 218 (58) 332 (59) 0.022
Controlled hypothermia 84 (8) 5 (3) 25 (7) 54 (10) 0.011
ICP monitoring 507 (46) 72 (41) 150 (40) 285 (50) 0.004
Treatment restriction 206 (19) 33 (19) 68 (18) 105 (19) 0.972
Platelets (109) 168 (118, 225) 156 (99, 231) 153 (111, 220) 174 (123, 225) 0.250
Markers of injury severity
APACHE II score 24 (19, 28) 27 (22, 32) 24 (19, 28) 23 (19, 27) <0.001
Glasgow Coma Scale      
 3 to 5 657 (59) 118 (68) 221 (59) 318 (56) 0.047
 6 to 8 267 (24) 38 (22) 86 (23) 143 (25)  
 9 to 12 192 (17) 18 (10) 68 (18) 106 (19)  
TISS-76 total score 133 (69, 287) 116 (69, 284) 131 (70, 278) 138 (68, 314) 0.803
TISS-76 average score 33 (29, 38) 35 (29, 39) 32 (28, 37) 33 (29, 38) 0.012
ICU length of stay, days 3 (1, 7) 2 (1, 7) 3 (1, 7) 3 (1, 8) 0.309
Hospital length of stay, days 6 (3, 14) 7 (3, 15) 6 (2–11) 7 (3, 14) 0.016
  1. Continuous variables are presented as median (IQR) and categorical variables as n (%); ICP, intracranial pressure; APACHE II, acute illness severity and chronic health evaluation II; TISS-76, therapeutic intervention scoring system 76.