Continuous Variables | Mean | SD | Mean with Change in Intention to Drive (SD) | P-value1 | Change to Drive Later Crude OR (95% CI) | P-value | t | dF | |
Earlier | Later | ||||||||
Passengers in car (if driving) | 2.11 | 1.31 | 2.10 (1.30) | 2.78 (1.25) | 0.04 | 1.534 (1.02 to 2.30) | 0.04 | −2.154 | 60.90 |
Age | 21.76 | 3.55 | 22.12 (4.06) | 22.15 (3.01) | 0.97 | ||||
Sleep hours | 5.97 | 1.87 | 5.76 (1.43) | 6.00 (3.39) | 0.61 | ||||
Units of alcohol last 24 h | 12.52 | 6.42 | 11.15 (5.52) | 12.32 (6.08) | 0.39 | ||||
Categorical Variables | All | Change in Intention to Drive | P-value2 | χ2 | dF | ||||
N | % | Earlier % (n) | Later % (n) | ||||||
Gender | 0.12 | 2.45 | 1 | ||||||
Male | 247 | 60 | 39 (19) | 61 (30) | |||||
Female | 162 | 40 | 58 (15) | 42 (11) | |||||
Licence Class | 0.92 | 8.51 | 2 | ||||||
No licence/Learner | 15 | 4 | 0 (0) | 0 (0) | |||||
Provisional 1 | 39 | 9 | 40 (2) | 60 (3) | |||||
Provisional 2 | 147 | 36 | 48 (13) | 52 (14) | |||||
Full licence | 208 | 51 | 44 (19) | 56 (24) | |||||
Frequency of Alcoholic Drinks | 0.521 | 2.26 | 1 | ||||||
Once a week or less | 198 | 49 | 53 (21) | 47 (19) | |||||
More than once a week | 209 | 51 | 37 (13) | 63 (22) | |||||
Frequency of Binge Drinking Sessions | 0.69 | 0.753 | 1 | ||||||
Once a month or less | 237 | 58 | 42 (20) | 58 (27) | |||||
Weekly or more | 172 | 42 | 50 (14) | 50 (14) |