Demographic characteristics by treatment group
| Group (sample size) | No (%) with driver record | Mean (SD) age* of drivers | % Drivers who are male |
|---|---|---|---|
| *Age on date of beginning treatment (treated groups) or median value of these dates (control group). | |||
| Control (518) | NA | 34.0 (7.5) | 77.2 |
| Alcohol (100) | 71 (71.0) | 39.3 (8.1) | 78.9 |
| Cannabis (96) | 77 (80.2) | 29.6 (6.4) | 75.3 |
| Cocaine (92) | 68 (73.9) | 32.4 (7.4) | 83.8 |
| Alcohol and cannabis (85) | 60 (70.6) | 32.4 (6.9) | 85.0 |
| Alcohol and cocaine (83) | 51 (61.4) | 32.3 (6.4) | 78.4 |
| Cannabis and cocaine (85) | 53 (62.4) | 30.3 (5.9) | 92.5 |
| Alcohol, cocaine, cannabis (49) | 31 (63.3) | 32.4 (7.2) | 77.4 |