ArticleJAMA network open2026
Prior Concussions and Risk of Disability for Patients After a Motor Vehicle Crash.
Article in JAMA network open, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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.
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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.
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Who cites it
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Authors and funding
3 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Importance: Recovery after a motor vehicle crash can be slow, frustrating, and incomplete with lingering neurocognitive complications. Objective: To examine whether a prior concussion is associated with increased risk of long-term disability after a motor vehicle crash. Design, Setting, and Participants: This cohort study included adults surviving a motor vehicle crash treated in Ontario, Canada, from April 2003 to March 2023 with analyses to November 2025. Exposure: Prior concussion. Main Outcome and Measures: Long-term disability defined by official social service records, comparing those with a prior concussion and those with no history of a prior concussion. Results: A total of 907 984 patients injured in a motor vehicle crash were included (mean [SD] age, 37 [14] years; 472 435 male [52.0%]); 19 851 patients had a prior concussion and 888 133 had no prior concussion. A total of 54 678 patients were subsequently diagnosed with long-term disability over 9 543 505 patient-years of follow-up (mean [SD], 10.5 [5.8] years), equal to an absolute risk of 1 in 17 per decade (5.7 per 1000 patient-years). Patients with a prior concussion had a 15% higher adjusted risk of long-term disability (95% CI, 9%-21%; P < .001) compared with those with no prior concussion. The increased risk of long-term disability was independent of other measured risk factors, applied to diverse patient groups, and included those involved as passengers or pedestrians. The increased risk extended across a spectrum of crash severity, was accentuated for single-vehicle events, replicated in analyses with artificial intelligence models adjusting for confounding, and remained distinct from the risks of death, readmission, or short-term health care costs. Conclusions and Relevance: This population-based cohort study suggests a significant increased risk of long-term disability after a motor vehicle crash, particular among patients with a prior concussion. More efforts at concussion prevention and traffic safety counseling may be justified for patients.
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