Table 3 Multinomial logistic regression showing odds ratios (OR) and confidence intervals (CI) for different duration of new SA for individuals with mild traumatic brain injury sustained in a traffic accident, by sociodemographic and injury characteristics

Total

4736

86.5

257

4.7

304

5.6

176

3.2

Sex

 Women

2402

50.7

160

62.3

1.60 (1.24–2.08)

1.81 (1.38–2.38)

161

53.0

1.09 (0.87–1.38)

1.30 (1.02–1.66)

88

50.0

0.97 (0.72–1.31)

1.26 (0.91–1.73)

 Men

2334

49.3

97

37.7

ref.

ref.

143

47.0

ref.

ref.

88

50.0

ref.

ref.

Age group, years

 18–24

1639

34.6

27

10.5

0.26 (0.19–0.42)

0.35 (0.22–0.56)

48

15.8

0.39 (0.27–0.57)

0.45 (0.30–0.65)

25

14.2

0.50 (0.29–0.84)

0.63 (0.36–1.09)

 25–34

1043

22.0

65

25.3

ref.

ref.

78

25.7

ref.

ref.

32

18.2

ref.

ref.

 35–44

843

17.8

62

24.1

1.18 (0.82–1.69)

1.03 (0.70–1.50)

76

25.0

1.21 (0.87–1.68)

1.25 (0.89–1.77)

45

26.6

1.74 (1.10–2.76)

1.79 (1.10–2.92)

 45–54

739

15.6

60

23.3

1.30 (0.91–1.87)

1.09 (0.74–1.61)

67

22.0

1.21 (0.86–1.70)

1.26 (0.88–1.80)

46

26.1

2.03 (1.28–3.22)

1.97 (1.20–3.21)

 55–63

472

10.0

43

16.7

1.46 (0.98–2.18)

1.25 (0.81–1.92)

35

11.5

0.99 (0.66–1.50)

1.08 (0.70–1.67)

28

15.9

1.93 (1.15–3.25)

2.03 (1.16–3.55)

Education level

 Elementary school

925

19.5

25

9.7

0.37 (0.24–0.58)

0.88 (0.54–1.42)

43

14.1

0.63 (0.44–0.91)

1.10 (0.73–1.64)

29

16.5

0.83 (0.53–1.31)

1.63 (0.99–2.71)

 High school

2329

49.2

125

48.6

0.74 (0.57–0.97)

1.06 (0.79–1.41)

152

50.0

0.89 (0.69–1.14)

1.07 (0.81–1.41)

91

51.7

1.03 (0.74–1.45)

1.28 (0.88–1.84)

 University/College

1482

31.3

107

41.6

ref.

ref.

109

35.9

ref.

ref.

56

31.8

ref.

ref.

Born in Sweden

 No

688

14.5

44

17.1

1.22 (0.87–1.70)

1.19 (0.83–1.71)

55

18.1

1.30 (0.96–1.76)

1.37 (0.99–1.91)

34

19.3

1.41 (0.96–2.07)

1.41 (0.93–2.16)

 Yes

4048

85.5

213

82.9

ref.

ref.

249

81.9

ref.

ref.

142

80.7

ref.

ref.

Marital status

 Not married

3589

75.8

149

58.0

0.44 (0.34–0.57)

0.71 (0.53–0.95)

210

69.1

0.71 (0.56–0.92)

1.09 (0.82–1.44)

106

60.2

0.48 (0.36–0.66)

0.79 (0.55–1.11)

 Married

1147

24.2

108

42.0

ref.

ref.

94

30.9

ref.

ref.

70

39.8

ref.

ref.

Urbanization

 Cities

1802

38.0

96

37.4

ref.

ref.

110

36.2

ref.

ref.

63

35.8

ref.

ref.

 Towns and suburbs

2018

42.6

124

48.2

1.15 (0.88–1.52)

1.14 (0.85–1.51)

121

39.8

0.98 (0.75–1.28)

0.96 (0.73–1.26)

77

43.8

1.09 (0.78–1.53)

0.94 (0.66–1.35)

 Rural areas

916

19.3

37

14.4

0.76 (0.52–1.12)

0.73 (0.49–1.10)

73

24.0

1.31 (0.96–1.77)

1.22 (0.88–1.69)

36

20.5

1.12 (0.74–1.71)

0.86 (0.55–1.34)

Income from work

 No

3475

73.4

244

94.9

0.15 (0.08–0.26)

0.20 (0.11–0.35)

274

90.1

0.30 (0.21–0.44)

0.34 (0.23–0.51)

170

96.6

0.10 (0.04–0.22)

0.10 (0.04–0.23)

 Yes

1261

26.6

13

5.1

ref.

ref.

30

9.9

ref.

ref.

6

3.4

ref.

ref.

Type of road user

 Pedestrians

618

13.0

34

13.2

ref.

ref.

31

10.2

ref.

ref.

13

7.4

ref.

ref.

 Bicyclists

1634

34.5

86

33.5

0.96 (0.64–1.44)

0.81 (0.53–1.24)

95

31.3

1.16 (0.77–1.76)

1.01 (0.66–1.55)

44

25.0

1.28 (0.68–2.39)

1.06 (0.56–2.01)

 Car occupants

952

20.1

61

23.7

1.17 (0.76–1.79)

1.38 (0.88–2.17)

79

26.0

1.65 (1.08–2.54)

1.65 (1.06–2.58)

62

35.2

3.10 (1.69–5.68)

3.28 (1.75–6.14)

 Other road users

1532

32.3

76

29.6

0.90 (0.60–1.37)

0.89 (0.58–1.37)

99

32.6

1.29 (0.85–1.95)

1.24 (0.81–1.90)

57

32.4

1.77 (0.96–3.25)

1.80 (0.96–3.37)

Inpatient health care

 No

3402

71.8

145

56.4

ref.

ref.

159

52.3

ref.

ref.

73

41.5

ref.

ref.

 Yes

1334

28.2

112

43.6

1.97 (1.53–2.54)

2.23 (1.71–2.91)

145

47.7

2.33 (1.84–2.94)

2.46 (1.93–3.13)

103

58.5

3.60 (2.65–4.89)

3.71 (2.70–5.11)