Riley Brandt, University of Calgary
July 20, 2023
Children’s IQ not diminished by concussion, study finds
The angst parents feel when their children sustain injuries is surely one of the universal conditions of parenthood. That anxiety is heightened greatly when those injuries involve concussions. But a new study led out of the University of Calgary, published July 17 in the medical journal Pediatrics, may set worried parental minds slightly at ease.
The findings — taken from emergency room visits in children’s hospitals in Canada and the United States — show that IQ and intelligence is not affected in a clinically meaningful way by paediatric concussions.
The study compares 566 children diagnosed with concussion to 300 with orthopedic injuries. The children range in age from eight to 16 and they were recruited from two cohort studies. The Canadian cohort encompasses data collected from five children’s hospital emergency rooms, including Alberta Children’s Hospital in Calgary, along with those in Vancouver, Edmonton, Ottawa, and Montreal (CHU Sainte-Justine). In the Canadian hospitals, patients completed IQ tests three months post-injury.
The U.S. cohort was conducted at two children’s hospitals in Ohio, wherein patients completed IQ tests three to 18 days post-injury.
“Obviously there’s been a lot of concern about the effects of concussion on children, and one of the biggest questions has been whether or not it affects a child’s overall intellectual functioning,” says Dr. Keith Yeates, PhD, a professor in UCalgary’s Department of Psychology and senior author of the Pediatrics paper. Yeates is a renowned expert on the outcomes of childhood brain disorders, including concussion and traumatic brain injuries.
“The data on this has been mixed and opinions have varied within the medical community,” says Yeates. “It’s hard to collect big enough samples to confirm a negative finding. The absence of a difference in IQ after concussion is harder to prove than the presence of a difference.”
Combining the Canadian and U.S. cohorts gave the Pediatrics study an abundant sample and it allowed Yeates and his co-authors — from universities in Edmonton, Montreal, Vancouver, Ottawa, Atlanta, Utah, and Ohio, along with Calgary’s Mount Royal University — to test patients with a wide range of demographics and clinical characteristics.
“We looked at socioeconomic status, patient sex, severity of injuries, concussion history, and whether there was a loss of consciousness at the time of injury,” says Yeates. “None of these factors made a difference. Across the board, concussion was not associated with lower IQ.”
The children with concussion were compared to children with orthopedic injuries other than concussion to control for other factors that that might affect IQ, such as demographic background and the experience of trauma and pain. This allowed the researchers to determine whether the children’s IQs were different than what would be expected minus the concussion.
The findings of the study are important to share with parents, says Dr. Ashley Ware, PhD, a professor at Georgia State University and lead author of the paper. While the Pediatrics research was underway, Ware was a Killam Postdoctoral Fellow at UCalgary, where Yeates was her supervisor.
“Understandably, there’s been a lot of fear among parents when dealing with their children’s concussions,” Ware says. “These new findings provide really good news, and we need to get the message to parents.”
Dr. Stephen Freedman, MD, co-author of the paper, a professor of paediatrics and emergency medicine at the Cumming School of Medicine, agrees. “It’s something doctors can tell children who have sustained a concussion, and their parents, to help reduce their fears and concerns,” says Freedman. “It is certainly reassuring to know that concussions do not lead to alterations in IQ or intelligence.”
Another strength of the Pediatrics research is that it incorporates the two cohort studies, one testing patients within days of their concussions and the other after three months.
“That makes our claim even stronger,” says Ware. “We can demonstrate that even in those first days and weeks after concussion, when children do show symptoms such as a pain and slow processing speed, there’s no hit to their IQs. Then it’s the same story three months out, when most children have recovered from their concussion symptoms.
“Thanks to this study we can say that, consistently, we would not expect IQ to be diminished from when children are symptomatic to when they’ve recovered.”
She adds: “It’s a nice ‘rest easy’ message for the parents.”
Keith Yeates, PhD, is a professor in the Department of Psychology at the Faculty of Arts, and a member of the Owerko Centre, Alberta Children’s Research Institute and the Hotchkiss Brain Institute at the Cumming School of Medicine.
The study is supported by the National Institutes of Health (Eunice Kenney Shriver National Institute of Child Health and Human Development) and Canadian Institutes of Health Research. Additional support was provided to individuals; Ronald and Irene Ward Chair in Pediatric Brain Injury (Yeates), Canadian Institutes for Health Research Embedded Clinician Researcher Salary Award (Dr. Brian Brooks, PhD), Harley N. Hotchkiss-Samuel Weiss and Killam Postdoctoral Fellowship (Ware); and the Alberta Children’s Hospital Foundation Professorship in Child Health and Wellness (Freedman).
Several UCalgary faculty were members of the Pediatric Emergency Research Canada A-CAP study team that assisted with the conceptualization and design of the parent study: Drs. Karen Barlow, MD, Francois Bernier, MD, Carolyn Emery, PhD, Ashley Harris, PhD, Ryan Lamont, MD, Catherine Lebel, PhD, Kelly Mrklas, PhD, Angelo Mikrogianakis, MD, Kathryn Schneider, PhD, Lianne Tomfohr, PhD, and Tyler Williamson, PhD.
Integrated Concussion Research Program
The Integrated Concussion Research Program (ICRP) is a university-wide initiative to study concussion, which has brought together experts from the Cumming School of Medicine, Faculty of Kinesiology, Faculty of Arts, and Schulich School of Engineering, with support from the Alberta Children’s Hospital Research Institute (ACHRI) and the Hotchkiss Brain Institute (HBI). The Alberta Children’s Hospital Foundation was instrumental in the creation of the ICRP and provides continuing support.
Child Health and Wellness
The University of Calgary is driving science and innovation to transform the health and well-being of children and families. Led by the Alberta Children’s Hospital Research Institute, top scientists across the campus are partnering with Alberta Health Services, the Alberta Children’s Hospital Foundation, and our community to create a better future for children through research.