Evidence map›Paper›PMID 23674137›Full record

ArticleBMJ (Clinical research ed.)2013

Helmet legislation and admissions to hospital for cycling related head injuries in Canadian provinces and territories: interrupted time series analysis.

Jessica Dennis, Tim Ramsay, Alexis F Turgeon, Ryan Zarychanski

Abstract readComparative Study
In one paragraph

Article in BMJ (Clinical research ed.), 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 28 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
28citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from 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.

2 · The registry

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.

3 · Its place in the literature

Who cites it

28 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Impacts of new cycle infrastructure on cycling levels in two French cities: an interrupted time series analysis.The international journal of behavioral nutrition and physical activity · 2022
    Pooled it
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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

4 authors.

Jessica DennisDivision of Epidemiology, Dalla Lana School of Public Health, University of Toronto, 155 College Street, Toronto, ON M5T 3M7, Canada. jessica.dennis@mail.utoronto.ca
Tim Ramsay
Alexis F Turgeon
Ryan Zarychanski

Funding

Canadian Institutes of Health Research
6 · The paper itself

Abstract

objectiveTo investigate the association between helmet legislation and admissions to hospital for cycling related head injuries among young people and adults in Canada.

designInterrupted time series analysis using data from the National Trauma Registry Minimum Data Set.

settingCanadian provinces and territories; between 1994 and 2003, six of 10 provinces implemented helmet legislation.

participantsAll admissions (n=66,716) to acute care hospitals in Canada owing to cycling related injury between 1994 and 2008.

main outcome measureRate of admissions to hospital for cycling related head injuries before and after the implementation of provincial helmet legislation.

resultsBetween 1994 and 2008, 66,716 hospital admissions were for cycling related injuries in Canada. Between 1994 and 2003, the rate of head injuries among young people decreased by 54.0% (95% confidence interval 48.2% to 59.8%) in provinces with helmet legislation compared with 33.1% (23.3% to 42.9%) in provinces and territories without legislation. Among adults, the rate of head injuries decreased by 26.0% (16.0% to 36.3%) in provinces with legislation but remained constant in provinces and territories without legislation. After taking baseline trends into consideration, however, we were unable to detect an independent effect of legislation on the rate of hospital admissions for cycling related head injuries.

conclusionsReductions in the rates of admissions to hospital for cycling related head injuries were greater in provinces with helmet legislation, but injury rates were already decreasing before the implementation of legislation and the rate of decline was not appreciably altered on introduction of legislation. While helmets reduce the risk of head injuries and we encourage their use, in the Canadian context of existing safety campaigns, improvements to the cycling infrastructure, and the passive uptake of helmets, the incremental contribution of provincial helmet legislation to reduce hospital admissions for head injuries seems to have been minimal.

Indexed as

AdolescentAdultAge DistributionBicyclingCanadaConfidence IntervalsCraniocerebral TraumaDatabases, FactualFemaleHead Protective DevicesHospitalizationHumansIncidenceInjury Severity ScoreMalePatient Admission

Identifiers

PMID23674137
PMCPMC3654159

What OpenQuestion holds

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Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.