A woman with a brain bleed is still a woman with a brain bleed
For a decade across Ontario, the moment a brain-injured patient arrived at a hospital carried a hidden variable: her sex. A study of more than 55,000 traumatic brain injury cases reveals that women were admitted to specialized trauma centers at a rate nearly a third lower than men, even after accounting for age, injury severity, and existing illness. The disparity points not to the injuries themselves but to something more elusive — the assumptions that shape a clinician's judgment in the seconds before a decision is made. It is a reminder that the architecture of care is built from human perception, and perception carries its own history.
- Women with traumatic brain injuries were admitted to specialized trauma centers at 26% — compared to 38% for men — a gap that survived every statistical correction researchers applied.
- The women were older, frailer, and more likely to have fallen from standing height, injuries that carry less visible drama and trigger less alarm in the triage chain.
- Unconscious bias may be quietly calibrating urgency assessments: a mental model of serious brain injury shaped by decades of male-dominated trauma research may cause female presentations to register as less critical.
- Ontario's triage system was already inconsistent before sex was factored in — overtriage and undertriage coexist under standardized guidelines, and gender appears to amplify that variability.
- Researchers are calling for targeted investigation into how sex and gender interact with triage decision-making, with the goal of translating findings into protocol changes that close the gap.
A decade of hospital records across Ontario — more than 55,000 traumatic brain injury patients — has revealed a persistent and troubling gap: women are admitted to specialized trauma centers at roughly two-thirds the rate of men. After controlling for age, injury severity, income, and existing health conditions, the disparity holds. Something beyond the clinical data is shaping where patients land.
The numbers are stark. Of the 21,719 women in the study, only 26 percent reached a trauma center. For men, the figure was 38 percent. That 12-point gap translates to roughly 2,000 women who did not receive specialized care that the male admission rate would have predicted they should.
The women were older — a median age of 78 versus 67 for men — and carried more diagnoses, including dementia and hypertension. Their injuries more often came from low-energy falls: slipping at home, falling from standing height. These mechanisms don't announce themselves as emergencies. They don't trigger the same alarm. And so, before a patient even reaches a hospital, the triage calculus may already be working against her.
Dr. Natalia Angeloni and her colleagues at Sunnybrook Health Sciences Centre identify two forces at work. The first is mechanical: low-energy falls are systematically deprioritized. The second is subtler — unconscious bias may shape how clinicians read severity, particularly when the patient is elderly and female and the injury looks like something expected in that population. A third factor compounds both: trauma research has historically enrolled more men, meaning the clinical intuition for what a serious brain injury looks like may be quietly calibrated to a male presentation.
Ontario's triage system was already inconsistent before sex entered the picture. The researchers are now calling for direct investigation into whether bias — conscious or not — is operating in those decisive moments when a clinician determines where a patient goes. They want that answer to do more than explain the gap. They want it to close it.
A study of more than 55,000 patients treated for traumatic brain injury across Ontario has uncovered a stark disparity in who gets routed to specialized trauma centers—and the gap breaks along gender lines. Women with brain injuries are admitted to these centers at roughly two-thirds the rate of men, even when researchers strip away the usual explanations: age, how severe the injury actually was, existing health conditions, income. The difference persists. It suggests something else is happening in the moment a patient arrives at the hospital and a clinician decides where they go.
The data comes from a decade of hospital admissions records, April 2009 through March 2020, covering 55,606 people. Of those, 21,719 were women. Only 5,666 women—26 percent—ended up in a trauma center. For men, the figure was 12,984 out of 34,887, or 38 percent. That 12-percentage-point gap is the kind of number that stops you. It means roughly 2,000 fewer women received specialized trauma care than the admission rate for men would predict.
The women in the study were, on average, older than the men—a median of 78 years versus 67. They carried more diagnoses: dementia and high blood pressure showed up more often in their charts. The men, by contrast, had more severe head injuries on paper. A third of male patients had high-energy trauma; only a quarter of women did. So the women were frailer, older, and their injuries looked less dramatic. Yet that still doesn't explain why they were sent to trauma centers at half the rate.
Dr. Natalia Angeloni, a critical care physician at Sunnybrook Health Sciences Centre and a PhD student at the University of Toronto, and her colleagues point to two mechanisms at work. The first is mechanical: women's injuries tend to come from low-energy falls—slipping at home, falling from standing height—while men's injuries more often involve higher-energy events. A fall from ground level doesn't trigger the same alarm in paramedics or emergency room staff. It doesn't look like an emergency. So it gets lower priority before it even reaches the hospital. The second mechanism is harder to name but no less real. Unconscious bias—the kind that operates beneath awareness—may shape how clinicians assess whether an injury is serious. A woman with a brain bleed from a fall might be coded as less urgent simply because she's a woman, because the injury mechanism was low-energy, or because she's elderly and falls are "expected" in that population.
There's a third factor the researchers mention almost in passing: women are underrepresented in trauma research itself. The studies that build our understanding of how brain injuries present, how they progress, what they look like—those studies have historically enrolled more men. So clinicians' mental model of a serious brain injury may be unconsciously calibrated to a male presentation. When a woman arrives with different symptoms or a different injury pattern, it may not register as urgent.
The Ontario triage system, the researchers note, is already struggling. There's overtriage—sending patients who don't need specialized care to trauma centers—and undertriage, the opposite problem. The system is inconsistent even with standardized guidelines in place. Layer sex and gender onto that variability, and you get what the data shows: women falling through the cracks at a measurable rate. The researchers are calling for investigation into whether conscious and unconscious bias is shaping these decisions, the way similar investigations have reshaped care in other medical domains. They want to know what's happening in those moments when a clinician decides where a patient goes. And they want the answer to guide changes that actually work.
Citações Notáveis
Injuries in female patients are more often associated with lower-energy mechanisms, such as ground-level falls, that may attract less attention and lead to lower prehospital priority, and unconscious sex-related bias may contribute to differential recognition of severity of injury.— Dr. Natalia Angeloni, critical care physician at Sunnybrook Health Sciences Centre
Understanding how triage variability interacts with sex and gender is critical. The role of conscious and unconscious bias in clinical decision-making should be explored, with results guiding targeted interventions to reduce disparities.— Study authors
A Conversa do Hearth Outra perspectiva sobre a história
Why does a 12-percentage-point gap in admission rates matter if the injuries themselves are less severe in women?
Because severity isn't the only thing that matters. A woman with a brain bleed is still a woman with a brain bleed. If she's not getting to a trauma center, she's not getting the specialized imaging, neurosurgery, monitoring she might need. The gap persists even when you account for severity—meaning something else is filtering her out.
You're suggesting the paramedics or emergency doctors are making a judgment call based on gender?
Not necessarily consciously. But yes. A fall from standing height in a 78-year-old woman reads differently in someone's mind than the same injury mechanism in a 67-year-old man. The woman's age, the low-energy nature of the fall—those facts combine to create a story that feels less urgent. And that story shapes where she gets sent.
Could it just be that women are actually less likely to have severe injuries from falls?
The data controls for that. The researchers looked at injury severity and it didn't explain the gap. Women with comparable injuries to men are still being admitted to trauma centers at lower rates. So no—it's not that their injuries are actually less serious. It's that they're being triaged as if they are.
What changes if we know this is happening?
Everything, potentially. Right now, the triage guidelines exist but they're applied inconsistently. If you can show that bias—conscious or unconscious—is part of that inconsistency, you can design interventions. Training. Checklists. Removing the moment where a clinician's gut feeling overrides the protocol. You can measure whether those changes work.
Is this specific to Ontario or is this likely everywhere?
Ontario is where the data exists and where the study was done. But the mechanisms they describe—low-energy falls being deprioritized, unconscious bias in severity assessment, women being underrepresented in trauma research—those aren't regional. This is probably happening in other places too.