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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