Trial reportJournal of studies on alcohol and drugs2025
Long-Term Effects of a Multi-Component Community-Level Intervention to Reduce Single-Vehicle Nighttime Crashes: Follow-Up Findings From a 24-Community Randomized Trial.
Trial report in Journal of studies on alcohol and drugs, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Authors and funding
2 authors.
Funding
Abstract
objectiveThis follow-up study examines whether a multi-component, high-visibility alcohol enforcement intervention implemented in 12 California cities had long-term effects on alcohol-related motor vehicle crashes beyond the period of the original study. Previous results indicated a significant reduction in single-vehicle night-time (SVN) crashes among 15- to 30-year-olds in intervention cities relative to controls.
methodA randomized trial was conducted with 24 randomly chosen California cities from 2012 to 2017 to evaluate a multi-component intervention to reduce excessive drinking and driving while impaired among adolescents and young adults. Twelve of the cities were randomly assigned to the intervention condition and implemented high-visibility alcohol enforcement operations and other components from April 2013 to March 2016. Multi-level negative binomial regression analyses were conducted with motor vehicle crash data from 2010 to 2021 to examine whether SVN crashes among 15- to 30-year-olds decreased in intervention cities relative to controls after the multi-component intervention was implemented. Analyses controlled for community sociodemographic characteristics, the overall time trend, the COVID pandemic, and pre-intervention levels of SVN crashes and adjusted for correlation of repeated observations within cities over time.
resultsRegression analyses indicated a significantly lower level of monthly SVN crashes among 15- to 30-year-olds in intervention cities during post-intervention months through 2021 relative to control cities (incidence rate ratio [95% CI] = 0.88 [0.79, 0.98],
conclusionsStudy findings suggest that a multi-component, high-visibility alcohol enforcement intervention can have long-term effects on alcohol-related motor vehicle crashes and related injuries and fatalities among adolescent and young adult drivers.
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