ArticleBMJ open2025
Concussions and risk of a subsequent traffic crash: retrospective cohort analysis in Ontario, Canada.
Article in BMJ open, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
What it found
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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.
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
1 citing paper in PubMed.
- Prior Concussions and Risk of Disability for Patients After a Motor Vehicle Crash.JAMA network open · 2026Article
Corrections and comments
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Authors and funding
4 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundConcussion is an acute injury that may contribute to short-term limitations and potential long-term risks.
objectiveTo test whether a past concussion is associated with the risk of a subsequent serious motor vehicle crash.
designPopulation-based longitudinal cohort analysis.
settingOntario, Canada, from 1 April 2002 to 31 March 2022 (178 emergency departments). PATIENTS: Adults diagnosed with a concussion (cases) or an acute ankle sprain (controls), excluding individuals with a disqualifying illness (blindness, dementia, delirium), severe cases resulting in hospitalisation or those who died within 90 days. PRIMARY MEASURE: Subsequent motor vehicle crash requiring emergency medical care.
resultsWe identified 3 037 028 patients, including 425 158 with a concussion and 2 611 870 with an ankle sprain. A total of 200 603 patients were injured in a subsequent motor vehicle crash over a median follow-up of 10 years, equal to an absolute risk of 1 in 15 patients (6.64 per 1000 patient-years). Patients with a concussion had a 49% higher motor vehicle crash risk compared with those with ankle sprain (adjusted relative risk=1.49, 95% CI 1.47 to 1.50, p<0.001). The increased risk was particularly high in the early weeks after a concussion, remained independent of other observed risk factors, applied to diverse clinical groups and was further accentuated after repeated concussions. The risk extended across a spectrum of crash severity, was accentuated for single-vehicle events, replicated in analyses with artificial intelligence methods adjusting for confounding and remained distinct from the risks of other unrelated medical emergencies.
conclusionsThis study suggests a significant increased risk of a motor vehicle crash after a concussion that may justify a safety warning from clinicians.
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