Alberta.
Methods | Retrospective record review. | |
Participants | First and repeat offenders analysed separately. 2763 interlock participants (6% of which had mandatory sentencing) and 28427 controls. | |
Interventions | After a proportion of their suspension period had been completed and an educational/interventional program completed, interlocks were installed on vehicles for six months, or until the end of their suspension. July 1987 ‐ Sept 1996 | |
Outcomes | Survival analysis during and post interlock. | |
Notes | Program managed by the Driver Control Board. Quality assessment score 19/27 | |
Risk of bias | ||
Bias | Authors' judgement | Support for judgement |
Allocation concealment? | Unclear risk | D ‐ Not used |