Helmet use and bicycle-related trauma injury outcomes.
Lagina R Scott, Shahrzad Bazargan-Hejazi, Anaheed Shirazi and 4 others
PMID 31514542WHAT IT FOUND
Helmet use was not clearly linked to lower injury severity or shorter ICU stay overall, but it was linked to shorter hospital stays and lower death rates.
The study cannot prove helmets alone caused this.
Key findings
01Among 76,032 trauma-admitted patients involved in a bicycle-related accident with head or neck injury, only 22% were recorded as wearing a helmet.
02Helmet users had shorter hospital stays and lower total and in-hospital death rates, and after accounting for age, gender, and race or ethnicity they had lower injury severity; however, injury severity and ICU stay were not different in the overall comparison.
03Helmet use was lowest among children under 17 (12.1%) and among Black (6%) and Hispanic (7.6%) riders.
STILL TO COME
How it was doneWhat they found
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What it does not show
This was an existing hospital records analysis, not a randomised trial, so helmet users may have differed in other ways that affected outcomes. The registry is known to underreport injuries, and 9.7% of records had missing data that were removed. The study did not know the helmet type or design, or whether the crash involved a fall, a curb, or a motor vehicle. It included only bicyclists admitted for head or neck injury, so it does not describe all cycling injuries. Age was grouped with fixed cut-offs, which may bias interpretation. The paper's conclusion states that only Hispanics had higher mortality, while the results section reports higher total mortality for both Black and Hispanic patients.
Declared interests
The authors reported no conflicts of interest. The supplied publication types list extramural N.I.H. research support.
The easy way to misread this
Do not read the lower hospital stay and mortality as proof that helmets alone caused the better outcomes; helmet use was not assigned, and the study lacked helmet type and crash mechanism. Also, injury severity and ICU stay were not different in the overall comparison.