Table 1 Characteristics of the sample
| Â | Before (n = 4534) | After (n = 3019) | No response (n = 1515) | Â |
|---|---|---|---|---|
| Â | % | % | % | P* |
Male gender | 68.3 | 70.3 | 64.4 | < 0.001 |
Age class, y | Â | Â | Â | Â |
16-19 | 23.1 | 24.5 | 20.5 | Â |
20-24 | 46.2 | 45.0 | 48.8 | Â |
25-29 | 20.8 | 20.0 | 22.2 | Â |
30-35 | 9.9 | 10.5 | 8.5 | 0.001 |
Educational level | Â | Â | Â | Â |
None | 3.0 | 2.8 | 3.2 | Â |
Mandatory school | 14.6 | 13.9 | 16.1 | Â |
High school | 52.8 | 57,2 | 44.1 | Â |
Diploma | 29.6 | 26.1 | 36.5 | < 0.001 |
Occupation | Â | Â | Â | Â |
Student | 47.2 | 47.1 | 47.3 | Â |
Employed | 45.1 | 45.1 | 45.0 | Â |
Unemployed | 7.7 | 7.8 | 7.7 | 0.9 |
Driving licence years | Â | Â | Â | Â |
No licence | 10.8 | 13.2 | 6.1 | Â |
< = 2 | 26.7 | 26.7 | 26.6 | Â |
3-5 | 25.0 | 24.1 | 26.8 | Â |
> 5 | 37.5 | 36.0 | 40.5 | < 0.001 |
Declaring alcohol assumption | 58.3 | 77.0 | 69.5 φ | 0.015 § |
Number of alcohol units declared ** | Â | Â | Â | Â |
0 | 44.6 | 23.0 | 34.2 φ | -- |
1-2 | 26.3 | 36.3 | 23.3 φ | -- |
> = 3 | 29.1 | 40.7 | 42.5 φ | 0.011 § |
Type of drinks declared | Â | Â | Â | Â |
None | 41.7 | 23.0 | 30.5 φ | -- |
Beer (only beer) | 27.6 (16.1) | -- | 28.2 (9.7) φ | -- |
Wine (only) | 12.2 (4.9) | -- | 18.1 (5.7) φ | -- |
Super alcoholics (only) | 21.4 (9.8) | -- | 24.7 (6.8) φ | -- |
Cocktails (only) | 7.8 (2.8) | -- | 11.5 (2.9) φ | -- |
Pops (only) | 15.0 (6.6) | -- | 32.9 (13.8) φ | -- |
Mixing alcoholics | 18.1 | -- | 30.7 φ | < 0.001 § |
Alcohol test: BAC, g/l | Â | Â | Â | Â |
0.0 | 45.3 | 28.3 | 35.8 φ | -- |
0.01-0.19 | 12.5 | 10.4 | 13.2 φ | -- |
0.20-0.49 | 16.3 | 18.1 | 17.1 φ | -- |
0.50-0.99 | 17.1 | 26.3 | 21.5 φ | -- |
> = 1.00 | 8.8 | 16.9 | 12.4 φ | 0.009 § |
Declaring (any) drug assumption | 7.5 | 4.5 | 13.7 φ | < 0.001 § |
Drug type declared | Â | Â | Â | Â |
Cannabis | 6.3 | 3.3 | 11.6 φ | 0.004 § |
Cocaine | 1.0 | 0.8 | 2.2 φ | -- |
Amphetamines | 0.4 | 0.8 | 0.5 φ | -- |
Benzodiazepine | 0.2 | 0.1 | 0.1 φ | -- |
Opiates | 0.1 | 0.0 | 0.3 φ | -- |
Other | 0.1 | 0.2 | 0.2 φ | -- |
Drug test: any drug (missing = 273) | -- | 6.3 | -- | -- |
Cannabis | -- | 4.3 | -- | -- |
Cocaine | -- | 1.4 | -- | -- |
Amphetamines | -- | 1.1 | -- | -- |
Benzodiazepine | -- | 0.4 | -- | -- |
Opiates | -- | 0.4 | -- | -- |
Mean age in years (SD) | 23.1 (4.2) | 23.1 (4.3) | 23.0 (4.1) | 0.9 § |