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Table 1 Patient characteristics in all patients with mild traumatic brain injury and in the cohort Trondheim MTBI follow-up study

From: The epidemiology of mild traumatic brain injury: the Trondheim MTBI follow-up study

Variable All patients identified with MTBI Trondheim MTBI follow-up study
n = 732 n = 379
Age, median [IQR] 28 [21,42] 25 [20,40]
Age, mean (SD) 31.7 (12.7) 31.2 (13.0)
Male, n (%) 450 (62) 247 (65)
Cause of injury
 Fall, n (%) 267 (37) 136 (36)
 Violence, n (%) 144 (20) 65 (17)
 Bicycle, n (%) 98 (13) 58 (15)
 Sport, n (%) 81 (11) 54 (14)
 MVA, n (%) 83 (11) 43 (11)
 Struck object, n (%) 37 (5) 17 (5)
 Other, n (%) 9 (1) 3 (1)
 Unknown, n (%) 13 (2) 3 (1)
Alcohol influence, n (%) unknown 169 (45)
Time of injury
 Weekend, n (%) 38 (53)a 210 (55)
Head CT performed (%)   300 (79)
Intracranial traumatic CT findings (yes/no) 37 (6) 21 (7)
GCS score, n (%)
 15 495 (67) 278 (73)
 14 86 (12) 57 (15)
 13 9 (1) 5 (1)
 Missingb 142 (19) 39 (10)
LOC, yes (%) unknown 175 (46)
PTA unknown 379 (100)
  < 1 h (%)   272 (72)
 1–24 h (%)   107 (28)
Other injuries, yes (%) unknown 133 (35)
Level of care, n (%)
 Discharged home from ED 517 (71) 261 (69)
 Observation < 24 h 89 (12) 61 (16)
 Neurosurgical admission 69 (9) 39 (10)
 Another admission 50 (7) 18 (5)
 Missing 7 (1)
  1. Abbreviations: MTBI mild traumatic brain injury, MVA motor vehicle accidents, GCS Glasgow coma scale, LOC loss of consciousness, PTA posttraumatic amnesia, ED emergency department
  2. aTime of CT
  3. bIn 17 out of the 39 patients with missing GCS score, the score could reliably be evaluated to either 14 or 15 based on the medical record