Table 2 Associations between demographic, alcohol and driving factors with perceived safety to drive

Gender

0.01

6.32

1

 Male

247

60

30 (73)

70 (174)

 Female

162

40

19 (30)

81 (132)

Licence Class

0.03

8.51

3

 No licence/Learner

15

4

47 (7)

53 (8)

 Provisional 1

39

9

38 (15)

62 (24)

 Provisional 2

147

36

24 (35)

76 (112)

 Full licence

208

51

22 (46)

78 (162)

Hours of Sleep

< 0.001

15.56

2

 0–4

87

21

40 (35)

60 (52)

 5–7

241

59

23 (56)

77 (185)

 8–13

81

20

15 (12)

85 (69)

Units of alcohol in last 24 h

< 0.001

18.04

3

 6 or less

61

15

11 (7)

89 (54)

 6–10

135

33

19 (25)

81 (110)

 11–15

120

29

31 (37)

69 (83)

 16 or more

92

23

37 (34)

63 (58)

Frequency of Alcoholic Drinks

0.24

1.358

1

 Once a week or less

198

49

23 (45)

77 (153)

 More than once a week

209

51

28 (58)

72 (151)

Frequency of Binge Drinking Sessions

0.07

3.15

1

 Once a month or less

237

58

22 (52)

78 (185)

 Weekly or more

172

42

30 (51)

70 (121)

Estimated BAC

< 0.001

53.94

4

 0.000

174

45

10 (18)

90 (156)

 0.001–0.049

149

39

28 (41)

72 (108)

 0.05–0.079

28

7

50 (14)

50 (14)

 0.08–0.0149

6

2

83 (5)

17 (1)

  > 0.15

28

7

54 (15)

46 (13)

Estimated BAC

< 0.001

37.98

1

 0.000–0.049

323

84

18 (59)

82 (264)

 0.05+

62

16

55 (34)

45 (28)

Actual BAC

0.07

8.67

4

 0.000

314

77

26 (81)

74 (233)

 0.001–0.049

78

19

19 (15)

81 (63)

 0.05–0.079

8

2

62.5 (5)

37.5 (3)

 0.08–0.0149

5

1

40 (2)

60 (3)

  > 0.15

2

1

0 (0)

100 (3)

Mean

SD

P-value²

t

dF

Age (n = 409)

21.76

3.55

21.19 (3.00)

21.95 (3.70)

0.04

−2.09

407

Work hours (n = 408)

29.30

15.15

29.6 (15.90)

29.2 (14.91)

0.86

0.21

166.61

Study hours (n = 406)

9.59

11.83

9.46 (11.71)

9.64 (11.90)

0.89

−1.37

178.68