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Table 3 Characteristics of patients enrolled and not enrolled in the Trondheim MTBI follow-up study based on head CT referrals

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

Variable Enrolled Not enrolled p-value ORa (95% CI)
n = 300 n = 160
Age, Median [IQR] 25 [20,43] 25 [20,38] 0.12  
Age, mean (SD) 31.5 (13.3) 29.4 (11.9) NC  
Male, n (%) 195 (65) 88 (55) 0.036 0.66 (0.45–0.97)
Injury cause, n (%)
 Fall 105 (35) 58 (36) 0.79 1.06 (0.71–1.58)
 Violence 47 (16) 41 (26) 0.01 1.86 (1.16–2.97)
 Bicycle 52 (17) 17 (11) 0.06 0.58 (0.32–1.04)
 Sport 45 (15) 16 (10) 0.13 0.63 (0.34–1.15)
 Motor vehicle accident 36 (12) 18 (11) 0.81 0.93 (0.51–1.70)
 Struck object 10 (3) 3 (2) 0.48 0.62 (0.17–2.32)
 Other or unknown 5 (2) 7 (4) 0.95 2.7 (0.84–8.65)
Time of CT, n (%)
 During weekend, Yes (%) 163 (54) 104 (65) 0.027 1.56 (1.05–2-32)
 During night, Yes % 130 (43) 75 (47) 0.47 1.15 (0.79–1.70)
GCS score, n (%)
 GCS score 15b 216 (79) 81 (82) 0.53 1.21 (0.67–2.17)
CT findings, n (%)
 Intracranial lesions 21 (7) 7 (4) 0.27 0.61b (0.25–1.46)
 Cranial fractures 4 (1) 0   NC
 Facial fractures 18 (6) 8 (5)   NC
Level of care, n (%)
 Discharged home from ED 184 (61) 122 (76) 0.001 0.49b (0.32–0.76)
  1. Abbreviations: CI confidence interval, NC not calculated, GCS Glasgow coma scale, OR odds ratio for not being enrolled
  2. abinary logistic regression with this category coded 0 and all other coded 1
  3. b87 cases without valid GCS score not included in the analysis