Trial reportAmerican journal of preventive medicine2021
Effects of a Community-Level Intervention on Alcohol-Related Motor Vehicle Crashes in California Cities: A Randomized Trial.
Trial report in American journal of preventive medicine, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers, 2 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
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.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
7 citing papers in PubMed, 2 syntheses or guidelines pooled it, 11 citations in OpenAlex.
- Community-Based Environmental Interventions to Prevent Alcohol Use in Adolescents: A Systematic Review.Drug and alcohol review · 2025Pooled it
- Determining a dosage threshold of drink-driving enforcement operations: A systematic review.Drug and alcohol review · 2022Pooled it
- 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.Journal of studies on alcohol and drugs · 2025Trial
- Optimizing sobriety checkpoints to maximize public health benefits and minimize operational costs.Injury epidemiology · 2023Article
- Interpol review of toxicology 2019-2022.Forensic science international. Synergy · 2023Review
- The geography of sobriety checkpoints and alcohol-impaired driving.Addiction (Abingdon, England) · 2022Article
- Alcohol-involved motor vehicle crashes and the size and duration of random breath testing checkpoints.Alcoholism, clinical and experimental research · 2021Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
3 authors at 1 institution in 1 country.
Funding
Abstract
introductionThis trial assesses the effects of a community-level alcohol prevention intervention in California on alcohol-related motor vehicle crashes. STUDY
designThe study is a group RCT with cities as the unit of assignment to condition and as the unit of analysis. SETTING/
participantsA total of 24 California cities with populations between 50,000 and 450,000 were chosen at random and roughly matched into pairs before randomly assigning 12 each to the intervention and control conditions.
interventionThe intervention, aimed at reducing excessive drinking among adolescents and young adults, included driving under the influence sobriety checkpoints, saturation patrols, and undercover operations to reduce service of alcohol to intoxicated patrons in bars, all including high visibility so the public would be aware of them. A measure of overall intervention intensity or dosage was created.
main outcome measuresThe outcome was a monthly percentage of all motor vehicle crashes that were single vehicle nighttime crashes for drivers aged 15-30 years.
resultsMultilevel analyses were conducted to examine intervention effects on alcohol-related crashes among drivers aged 15-30 years. Crash data were obtained in 2018 with data preparation and analysis conducted in 2019. Intent-to-treat analyses indicated a 17% reduction in the percentage of alcohol-involved crashes among drivers aged 15-30 years relative to controls, which translates to about 310 fewer crashes. Dosage was found to have a statistically significant effect on crashes among this age group, although not in the expected direction.
conclusionsEnhanced alcohol enforcement operations involving both community health and law enforcement agencies can help to reduce alcohol-impaired driving and related consequences among young people. Including measures of intervention dosage raises interesting questions about the understanding of the impact of the community intervention. Future studies should continue to further develop implementation strategies that may more effectively and efficiently reduce community alcohol-related harm.
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Registered trials
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