Dedobbeleer 2001.

Methods	Study design: controlled before‐after Sampling frame: St‐Croix School District in St‐Laurent City, Montreal, Quebec Sampling method: schools matched by urban, public, French‐speaking, and multi‐ethnic Description of the community coalition: A coalition of 15 partners, including public health organizations, community organizations (e.g. YMCA, St‐Laurent Youth Resources), schools, police, St‐Laurent City, parents, and youth representatives developed the project Coalition for Youth Quality of Life Project in St‐Laurent City, an industrial area on the west side of the Island of Montreal, Quebec, Canada, which has a large, multi‐ethnic immigrant population from Asia, North African, and Middle East. Training on intersectorial collaboration, youth development, and substance abuse was provided by professionals in partner organizations
Participants	Communities: St‐Laurent City, an industrial area on the west side of the Island of Montreal, Quebec Country: Canada Ages included in assessment: 791 students in 6th grade and 8th grade cohorts Reasons provided for selection of intervention community: higher‐risk, multi‐ethnic population of recent immigrants Intervention community (population size): St‐Laurent City (67,000) Comparison community (population size): same
Interventions	Name of intervention: Coalition for Youth Quality of Life Project Theory: Ecologic Participatory Framework, PROCEED Aim: to reduce alcohol and other drug use Description of costs and resources: Professionals from partner organization trained coalition members. Information on youth development, drug resistance, self esteem, and parent‐child communication was provided in a school setting Components of the intervention: skills development, parent education, competence enhancement, and youth mobilization Start date: coalition formed in 1990. Intervention in 1992 to 1993, 1993 to 1994 Duration: 2 school years (18 months)
Outcomes	Outcomes and measures (follow‐up months): Follow at 30 months: Alcohol use frequency 6th grade: OR 1.2, 0.46 to 3.18; 8th grade: OR .34, 0.12 to 0.97 Number of drinks 6th grade: OR 1.52, .60 to 3.85; 8th grade: OR 0.51, .20 to 1.32 Date (year) of pre and post measurements Pre‐test 1992 Post‐test 1995
Notes	Only 40% follow‐up at 30 months
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	High risk	Not randomized
Allocation concealment (selection bias)	High risk	No allocation concealment
Baseline outcome measurement similar	High risk	Frequency of alcohol consumption and amount of alcohol consumed differed at baseline
Baseline characteristics similar	High risk	Significant difference in age of 6th grade cohort at baseline
Blinding of outcome assessment (detection bias) All outcomes	High risk	Not blinded
Incomplete outcome data (attrition bias) All outcomes	High risk	Only 40% follow‐up at 30‐month measurement
Blinding of participants and personnel (performance bias) All outcomes	High risk	Participants and personnel not blinded
Protection against contamination	High risk	Intervention and control student cohorts in the same school district
Selective reporting (reporting bias)	Unclear risk	Alcohol use and amount of alcohol consumed were primary outcomes. Drug use was of low prevalence at baseline and was not reported at follow‐up