Study design
This study was a part of a larger evaluation project (Controlled Study of an Alcohol Preventive Interventions in Working Life; in Swedish: This study was a two-armed cluster randomized controlled study with parallel groups. A cluster-randomized trial was chosen because the prevention program was delivered at the organizational level, with a special focus on workplace policies and managers’ skills at identifying hazardous alcohol use at an early stage. The program was designed and delivered by Alna, a division of an occupational health service organization that provides prevention services related to harmful use (e.g. drugs, gambling) to workplaces [