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Objective: To examine preinjury life events as moderators of postconcussive symptoms (PCS) and quality of life (QoL) in children with pediatric mild traumatic brain injury (mTBI) versus orthopedic injury (OI)., Methods: Participants were 633 children with mTBI and 334 with OI, ages 8-16.99, recruited from 5 pediatric emergency departments and followed for 6 months postinjury as part of a prospective cohort study. Preinjury life events were measured retrospectively using the Child and Adolescent Survey of Experiences, PCS using the Health and Behavior Inventory (HBI) and Post-Concussion Symptom Interview (PCS-I), and QoL using the Pediatric Quality of Life Inventory (PedsQL). Analyses involved longitudinal regression using restricted cubic splines, with group, positive and negative life events, and time as primary predictors. Covariates included age, sex, race, socioeconomic status, preinjury history (i.e., headache, migraine, previous concussion), and parent-rated retrospective PCS-I, HBI, and PedsQL scores., Results: PCS and QoL were worse after mTBI than OI, but group differences declined with time (all p < .001). Group differences in PCS were larger at higher levels of positive life events, which predicted lower PCS (p= .03 to p < .001) and higher QoL (p = .048) after OI but not after mTBI. Negative life events predicted worse PCS and QoL in both groups (p = .002 to p < .001)., Conclusions: Preinjury positive life events moderate outcomes after pediatric injury, with a protective effect seen in OI but not in mTBI. Negative life events are consistently associated with worse outcomes regardless of injury type., (© The Author(s) 2024. Published by Oxford University Press on behalf of the Society of Pediatric Psychology. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)

Advanced diffusion-weighted imaging techniques have increased understanding of the neuropathology of paediatric mild traumatic brain injury (i.e. concussion). Most studies have examined discrete white-matter pathways, which may not capture the characteristically subtle, diffuse and heterogenous effects of paediatric concussion on brain microstructure. This study compared the structural connectome of children with concussion to those with mild orthopaedic injury to determine whether network metrics and their trajectories across time post-injury differentiate paediatric concussion from mild traumatic injury more generally. Data were drawn from of a large study of outcomes in paediatric concussion. Children aged 8-16.99 years were recruited from five paediatric emergency departments within 48 h of sustaining a concussion ( n = 360; 56% male) or mild orthopaedic injury ( n = 196; 62% male). A reliable change score was used to classify children with concussion into two groups: concussion with or without persistent symptoms. Children completed 3 T MRI at post-acute (2-33 days) and/or chronic (3 or 6 months, via random assignment) post-injury follow-ups. Diffusion-weighted images were used to calculate the diffusion tensor, conduct deterministic whole-brain fibre tractography and compute connectivity matrices in native (diffusion) space for 90 supratentorial regions. Weighted adjacency matrices were constructed using average fractional anisotropy and used to calculate global and local (regional) graph theory metrics. Linear mixed effects modelling was performed to compare groups, correcting for multiple comparisons. Groups did not differ in global network metrics. However, the clustering coefficient, betweenness centrality and efficiency of the insula, cingulate, parietal, occipital and subcortical regions differed among groups, with differences moderated by time (days) post-injury, biological sex and age at time of injury. Post-acute differences were minimal, whereas more robust alterations emerged at 3 and especially 6 months in children with concussion with persistent symptoms, albeit differently by sex and age. In the largest neuroimaging study to date, post-acute regional network metrics distinguished concussion from mild orthopaedic injury and predicted symptom recovery 1-month post-injury. Regional network parameters alterations were more robust and widespread at chronic timepoints than post-acutely after concussion. Results suggest that increased regional and local subnetwork segregation (modularity) and inefficiency occurs across time after concussion, emerging after post-concussive symptom resolve in most children. These differences persist up to 6 months after concussion, especially in children who showed persistent symptoms. While prognostic, the small to modest effect size of group differences and the moderating effects of sex likely would preclude effective clinical application in individual patients., Competing Interests: The authors report no competing interests., (© The Author(s) 2023. Published by Oxford University Press on behalf of the Guarantors of Brain.)

Objectives: To measure the association between psychosocial problems and persistent post-concussive symptoms (PCS) in youth who were seen in the emergency department with mild traumatic brain injury (mTBI) or orthopedic injury (OI)., Methods: From a larger prospective cohort study, Advancing Concussion Assessment in Pediatrics (A-CAP), 122 child-guardian pairs who presented to the emergency department with mTBI (N = 70) or OI (N = 52) were recruited for this cross-sectional sub-study. Each pair completed 2 measures assessing PCS burden at 2 weeks, 3 months, and 6 months post-injury. At one visit, pairs concurrently completed MyHEARTSMAP, a comprehensive, psychosocial self-assessment tool to evaluate 4 domains of mental wellness., Results: When measured at the same visit, children who self-reported moderate or severe Psychiatry domain concerns concurrently experienced a greater burden of cognitive symptoms (β = 5.49; 0.93-10.05) and higher overall PCS count (β = 2.59; 0.70-4.48) after adjusting for covariables, including retrospective pre-injury symptoms and injury group. Additionally, reports indicating mild Function domain severity were associated with increased cognitive (β = 3.34; 95% CI: 0.69-5.99) and somatic symptoms (β = 6.79; 2.15-11.42) and total symptom count (β = 1.29; 0.18-2.39)., Conclusion: Increasing severity in multiple domains of mental health is associated with more PCS in youth. While the differences in PCS between the mTBI and OI groups appeared somewhat larger for children with more mental health concerns, the interaction was not statistically significant; larger sample sizes are needed to evaluate the moderating effect of psychosocial difficulties on post-concussion symptoms., (© The Author(s) 2022. Published by Oxford University Press on behalf of the Society of Pediatric Psychology. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)

Objectives: This study was aimed to determine the sample size required to conduct an efficacy randomized controlled trial (RCT) to evaluate superiority of intranasal (IN) lidocaine to placebo as an analgesic option for children presenting to the paediatric emergency department (PED) with migraine or posttraumatic headache with migraine features and to evaluate study protocol feasibility., Study Design: This study is a double-blind RCT of children aged 7 to 16 years at a single-centre PED. Thirty-two participants were randomized to receive either IN 2% lidocaine or 0.9% sodium chloride. The primary outcome measure was the proportion of subjects with a Verbal Numeric Rating Scale pain score of <4 at 30 and 60 minutes post-IN therapy. Primary outcome data were analyzed using a test of differences between proportions. Secondary objectives included assessing the feasibility of our study protocol by evaluating recruitment rates, adverse drug events, and PED length of stay (LOS)., Results: Six of 17 participants in the lidocaine group and 2 of 15 in the placebo group were treated successfully. Using these proportions with 95% confidence intervals and 80% power, the sample size required to find a significant difference between proportions would be 67 participants per arm. Our enrolment rate was 55% and there were no serious adverse drug events. The median PED LOS was similar between groups., Conclusion: We determined the sample size required to conduct a definitive RCT to evaluate the superiority of IN lidocaine to placebo and found the study protocol is feasible but identified important considerations in PED migraine trial design., (© The Author(s) 2022. Published by Oxford University Press on behalf of the Canadian Paediatric Society. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)

Background: Mental health issues are increasingly prevalent across Canada, reflected in rising presentations to emergency departments. To effectively address the needs of children and youth seeking mental health-related care in the emergency department and to judiciously use scarce mental health-related resources, we need to better identify the specific areas of psychosocial needs and accessibility of associated services., Objective: To describe the types and severity of paediatric mental health-related presentations evaluated at a quaternary paediatric emergency department, and to explore the accessibility of community mental health-related resources., Methods: We conducted a retrospective cohort study of children and youth presenting to a quaternary paediatric emergency department who were assessed using HEARTSMAP, a validated mental health assessment and management tool. We reported the proportion who sought care for a psychiatric, social, or youth health-related mental health complaint. We contacted community mental health-related resources for their estimated wait times to determine accessibility., Results: Of 1,530 paediatric emergency presentations, 98.8% of patients had psychiatric issues (40.1% were severe), 78.0% of patients had social issues (17.1% were severe), and 71.5% had youth health issues (18.1% were severe). We contacted 123 community mental health-related resources. Community youth health and social services were somewhat accessible, with 50.0% and 38.7%, respectively, able to intake youth within a week of referral. Community psychiatric programs were least accessible, with 59.3% having wait times greater than 1 month., Conclusions: Many psychiatric concerns presenting in paediatric emergency departments have complex psychosocial challenges requiring non-psychiatric support. A need exists for improved accessibility to community psychiatric programs., (© The Author(s) 2022. Published by Oxford University Press on behalf of the Canadian Paediatric Society. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)

Objectives: To assess the knowledge gaps and need for continuing medical education (CME) resources for Canadian paediatric emergency department (PED) physician management of common tropical diseases., Methods: A cross-sectional survey study of Canadian PED was performed from May to July 2017 using the Pediatric Emergency Research Canada (PERC) database., Results: The response rate was 56.4% (133/236). The mean performance on the case-based vignettes identifying clinical presentation of tropical illnesses ranged from 59.9% to 76.0%, with only 15.8% (n=21) to 31.1% (n=42) of participants scoring maximum points. Those who 'always' asked about fever performed better than those who only 'sometimes' asked (40.4% versus 23.8%). For management cases, the majority of the participants (59.4% to 89.5%) were able to interpret investigations; however, many were unsure of subsequent actions relating to initial treatment, discharge instructions, and reporting requirements. Many would consult infectious diseases (87.8% to 99.3%). Fifty-three per cent of the participants reported a low comfort level in diagnosing or managing these patients. They rated the importance of CME materials with a median of 50/100, via various modalities such as case studies (71.9%), emphasizing a need for PED-specific content., Conclusion: This study identified a knowledge gap in the recognition and management of pediatric tropical diseases by Canadian PED physicians. There is a need for formal CME materials to supplement physician practice., (© The Author(s) 2020. Published by Oxford University Press on behalf of the Canadian Paediatric Society. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)

Objective: To evaluate the association between the use of nonrecommended pharmacology (salbutamol and corticosteroids) per national bronchiolitis guidelines, either during the index visit or at discharge, and system utilization measures (frequency of return visits [RTED] and on paediatric emergency department [PED] length of stay [LOS])., Study Design: We conducted a retrospective case control study of 185 infants (≤12 months old) who presented to the PED between December 2014 and April 2017 and discharged home with a clinical diagnosis of bronchiolitis. Inclusion criteria included ≥ 1 viral prodromal symptom and ≥ 1 physical exam finding of respiratory distress. Cases were defined as infants who had ≥ 1 RTED within 7 days of their index visit and controls were matched for age and acuity but without RTED. Logistic regression analysis and multivariable linear regression were used to assess the odds of RTED and PED LOS associated with nonadherence to pharmaceutical recommendations per AAP and CPS bronchiolitis guidelines., Results: Use of nonrecommended pharmacology per national bronchiolitis guidelines was documented among 39% of the 185 study participants. Adjusting for acuity of index visit, age, severe tachypnea, oxygen desaturation, and dehydration, use of nonrecommended pharmacology was not associated with RTED (odds ratio [OR]: 0.98, 95% confidence interval [CI]: 0.47 to 2.03). Use of salbutamol and corticosteroids, however, were each independently associated with increased PED LOS (58.3 minutes [P=0.01] and 116.7 minutes [P<0.001], respectively)., Conclusion: Nonadherence to the pharmaceutical recommendations of national bronchiolitis guidelines was not associated with RTED but salbutamol and corticosteroid use increased PED LOS., (© The Author(s) 2020. Published by Oxford University Press on behalf of the Canadian Paediatric Society. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)

Background: This article describes the provincial dissemination of HEARTSMAP, an evidence-based emergency department (ED) psychosocial assessment and disposition decision tool for clinician use with children and youth., Methods: HEARTSMAP was disseminated in partnership with local, child and youth mental health teams, as part of a quality improvement initiative implemented in British Columbia EDs. The target audience of education sessions were clinicians working in ED settings responsible for paediatric psychosocial assessments. We used the RE-AIM framework to evaluate the reach, effectiveness, adoption, implementation, and maintenance of HEARTSMAP dissemination, analyzing data from session evaluation forms and online tool data., Results: Education sessions reached 475 attendees, in 52 of 95 British Columbia EDs. HEARTSMAP training was well received by clinicians with 96% describing effective content including increased comfort in conducting paediatric psychosocial assessments and confidence in disposition planning after training. Clinicians identified unclear processes and lack of local resources as the main barriers to implementation. One-third of the attendees expressed willingness to use the tool, and 27% of registered clinicians have used the tool postimplementation., Conclusions: Our approach reached and effectively trained clinicians from over half of the province's EDs to use HEARTSMAP for emergency paediatric psychosocial assessments. For some, this provided greater comfort and confidence for these assessments and the following disposition decisions. This evaluation provides valuable insights on training clinicians to use a paediatric mental health tool within diverse ED settings and emphasized the need for ongoing support and institutional engagement to facilitate local, infrastructural, and operational processes for adoption and maintenance, postdissemination.

Introduction: Steadily increasing emergency department (ED) utilization has prompted efforts to increase resource allocation to meet demand. Little is known about the distribution and characteristics of patient arrivals by time of day. This study describes the variability and patterns of ED resource utilization related to patient, acuity, clinical, and disposition characteristics over a 24-hour period., Methods: Retrospective cross-sectional study of all visits to a tertiary children's hospital over a 1-year period. We use descriptive statistics to present ED visit details stratified by shift of arrival, and multivariable regression to explore the association between shift of presentation and hospital admission at index and 7-day return ED visits., Results: Of 46,942 visits during the study period, 12% arrived overnight, 42% during the day, and 45% during the evening with variability in pattern of shift arrival by day of week. Overnight arrivals had a higher acuity (Canadian Triage and Acuity Scale [CTAS]) and different presenting complaints (more viral infection, less minor trauma) than day and evening arrivals, but similar ED length of stay. Shift of arrival was not associated with admission to hospital, but age, gender, socioeconomic status (SES), and day of week were., Discussion: ED utilization patterns vary by shift of arrival. Though overnight arrivals represent a smaller proportion of total daily arrivals, their acuity is higher, and the spectrum of disease differs from day or evening arrivals., Conclusions: Understanding variations and patterns of ED utilization by shift of arrival and day of week may be helpful in tailoring resource allocation to more accurately and specifically meet demands.

Background: We recently introduced a clinical practice pathway for the management of asthma that uses the Pediatric Respiratory Assessment Measure (PRAM) to guide emergency department (ED) treatment and disposition. The pathway recommends discharge for patients who achieve improvement to PRAM <4 at 1 hour after the last bronchodilator. We evaluated practice variation and patient outcomes associated with PRAM-directed disposition recommendations., Methods: We conducted a retrospective cohort study of children aged 2 to 17 years treated for moderate asthma (PRAM score 4-7) using our asthma clinical pathway. We measured 1) the proportion of children discharged per pathway criteria who returned to our ED within 24 hours and 2) the proportion of children observed beyond the pathway discharge criteria who deteriorated (PRAM ≥4)., Results: We analyzed 385 patient records from September 2013 to February 2015. Among 145 (37.7%) patients discharged per pathway criteria, 4 (4/145; 2.8%) returned within 24 hours. The remaining 240 (62.2%) were observed beyond the pathway discharge criteria; 76/240 (31.7%) had a subsequent deterioration (PRAM score ≥ 4) and 25/240 (10.4%) were hospitalized. Of those who deteriorated, 46/76 (60.5%) worsened within the first additional hour of observation., Conclusion: We observed significant deviation from our PRAM-directed pathway discharge criteria and that a significant proportion of observed patients experienced clinical deterioration beyond the first hour of observation. We recommend observing children with moderate asthma for 2 or 3 hours from last bronchodilator therapy if PRAM < 4 is maintained, to capture the majority (97.7% or 99.7%) of patients who require further intervention and hospitalization.

Objectives: We explored practice-related factors associated with preventable unscheduled return visits to an emergency department (RTED)., Methods: We conducted a retrospective cohort study, using standardized review of health records. We included all visits with at least one RTED within 7 days of the index visit. Cases were reviewed by investigators and clinicians to identify: 1) the proportion of unscheduled RTED, 2) the proportion deemed clinically unnecessary and 3) the contribution of clinical practice pattern and system factors., Results: There were 2809 (7.3%) index visits associated with at least one RTED. Of these, 1983 (70.6%) were unscheduled, 784 (39.5%) were considered clinically unnecessary and 739 out of 784 medically unnecessary RTEDs (94.3%) were attributed to a mismatch between parental expectations and natural progression of disease that did not require Emergency Department (ED) reassessment or interventions. Eighty per cent of reviewed written discharge instructions lacked any anticipatory guidance around symptom range and duration and 21.2% contained instructions to return to the ED for signs and symptoms which do not require ED care. An administrative or system challenge was noted as the reason for the unnecessary and unscheduled RTED in 17.5%. In 3.4% of cases, nonemergency consultants were responsible for the disposition decision and discharge process., Conclusions: Unscheduled unnecessary return visits to our ED contribute to a significant proportion of our annual volume. Providing discharge instructions that help families distinguish expected range and duration of symptoms from signs requiring ED care was identified as a potential strategy to impact the frequency of unscheduled RTED.

Objective: HEARTSMAP is a tool developed to facilitate assessment and management of paediatric mental health (MH) patients by emergency department (ED) clinicians. We evaluate the inter-rater reliability of HEARTSMAP when administered by clinicians of various backgrounds., Methods: In a cross-sectional study initiated in 2016, collaborating clinician evaluators (n=16) applied the HEARTSMAP tool to evaluate a set of 50 fictional clinical vignettes, digitally in an approach consistent with the anticipated tool's access and usage in clinical settings. Evaluators came from different types of health centres from across the province of British Columbia (Canada), including remote/rural, regional and urban academic health centres., Results: We report moderate to near excellent agreement, overall among clinicians for all 10 of the tool's psychosocial sections (κ=0.43 to 0.93) and domain scores (κ=0.75 to 0.90), with acceptable agreement across all tool-triggered service recommendations (κ=0.36 to 0.65)., Conclusions: Our findings show that HEARTSMAP may be reliably used by ED clinicians in assessing MH issues among youth. Results from this study will assist in informing the wider clinical implementation of HEARTSMAP as a standard assessment tool, in diverse emergency care settings.

Background: General emergency department crowding negatively impacts patient care, and increases patient morbidity., Objectives: This study seeks to determine if markers of paediatric emergency department (PED) flow are independently associated with negative outcomes and increased health care utilization., Methods: We conducted a retrospective cohort study of PED visits from 2008 to 2012. Data were pulled from an electronic administrative database. Using multivariate logistic regression models, we measured the association between odds of adverse outcomes (hospital/paediatric intensive care unit [PICU] admission, unscheduled return visits and mortality) with markers of PED flow (shift mean length of stay [LOS] and daily rate of patients leaving without being seen [LWBS])., Results: We found an association between the daily LWBS proportion and the odds of being admitted to the hospital (odds ratio [OR]: 2.1; 95% confidence interval [CI]: 1.2, 3.7), as well as admission to the PICU (OR: 8.9; 95% CI: 1.1, 71.3). We found a statistically significant increase in the odds of admission if seen during shifts in the third or fourth quartile mean shift LOS. We observed lower odds of returning to the PED with increased daily LWBS proportions (OR: 0.4; 95% CI: 0.2, 0.7), but found no association between the odds of returning to the PED and mean shift LOS., Conclusion: While we found an association between our pre-defined measures of adverse outcomes and markers of PED flow (or crowding), further studies are needed to determine whether PED overcrowding is the cause or effect of increased hospital and PICU admissions.

Background: Constipation is a common condition in children. Little is known about the acute health care utilization of constipated children, including how many present to the paediatric emergency department (ED), the spectrum of presenting complaints, investigations and treatments used., Methods: We conducted a cross-sectional chart review of all 42,875 visits to British Columbia Children's Hospital ED between August 31, 2012 and September 1, 2013. All visits were assessed for a potential diagnosis of constipation and a total of 913 patients were included. We recorded the chief complaints, tests performed and therapies administered in the ED and measures of flow/efficiency including waiting time (WT), length of stay (LOS) and disposition., Results: Constipation-related visits comprised 2.1% of overall visits. Abdominal pain was found to be the most common presenting complaint in 65.6% of patients; however, 11.9% of patients presented with complaints unrelated to the gastrointestinal tract. Abdominal radiographs were obtained in nearly one-third of patients and almost half of the patients received a fleet enema in the ED. Only a quarter of patients were discharged home on longer-term management. Measures of ED flow were similar between groups, with no meaningful difference in WT or LOS. The vast majority of children (99.7%) were discharged home., Conclusions: Constipation can be treated as an out-patient, rather than burdening the paediatric ED unnecessarily. This study demonstrates over utilization of radiologic tests and invasive ED treatments and an under utilization of outpatient medication and dietary counselling that may contribute to unnecessary return ED visits.

Background: Subject recruitment is essential for conducting clinical research; however, there are very few studies evaluating research uptake by families in a paediatric setting., Objectives: To determine how frequently paediatric patients and their families receiving care at a tertiary paediatric hospital participated in research. The secondary objectives were to explore factors that influence patient families' decisions to participate in research and how they perceived their experiences., Methods: A cross-sectional study surveying families of children receiving care in a sample of clinical areas at a tertiary care paediatric hospital in British Columbia was conducted. A self-administered questionnaire was used, and was facilitated by trained interviewers. Descriptive statistics were used to report the proportion of patient families that have previously been invited to participate in research and, among these, the proportion who had agreed to participate. Patient families' perceptions of research and their past experiences therein were also reported., Results: A total of 657 families were approached, of which 543 were enrolled (82.6% response rate). Among the 439 families that had visited the hospital previously, 114 (26.0%) had been invited to participate in research and 99 (87%) had consented to participate. Of these 99 families, only one had a negative experience, and 84 (85%) of these participant families were at least somewhat likely to participate in research again in the future., Conclusions: Only one-quarter of families that had previously visited the hospital had been invited to participate in a research project. Of the families approached previously, there was a high rate of participation and willingness to participate in future research.

Objectives: To determine whether there is an association between childhood obesity and severe extremity fractures. Associations between obesity and complications related to the fracture and/or fracture management were also examined., Methods: The present study was a retrospective, cross-sectional study conducted at a tertiary care children's emergency department. Eligible cases for review were children (two to 17 years of age) with an extremity fracture. Severe extremity fractures were defined as those requiring manipulation under anesthesia, open operative repair and/or admission to hospital. The primary outcome was the proportion of severe extremity fractures and the secondary outcome was the proportion of complications., Results: A total of 1340 charts of children who presented with extremity fracture from January 2008 to December 2010 were reviewed. The mean (± SD) age of the study population was 9.1±4.0 years and 62.1% were male. Overall, 19.9% (95% CI 17.8% to 22.0%) were obese and 39.6% (95% CI 36.7% to 39.1%) sustained a severe extremity fracture. The OR of severe extremity fractures among obese versus nonobese children was 1.00 (95% CI 0.76 to 1.32), adjusted for age, sex and mechanism of injury. In addition, the OR of experiencing complications among obese relative to nonobese children was 1.12 (95% CI 0.68 to 1.85)., Conclusions: The results of the present study demonstrated that in children with extremity fractures, obese children were not at increased risk for sustaining more severe extremity fractures or subsequent complications compared with nonobese children.

Objective: To measure the impact of implementing an oral rehydration clinical pathway for children with mild to moderate dehydration from gastroenteritis in the paediatric emergency department (ED) on the indicators of health care utilization., Methods: ED charts of children, six months to 17 years of age, meeting the criteria for the oral rehydration clinical pathway were reviewed. There were three 12-month periods of data collection: pre-implementation, transition and postimplementation. The clinical pathway consisted of a standard nursing assessment form and instructions on oral rehydration to be initiated and maintained by caregivers while waiting to see a physician. The primary outcome measure was ED length of visit (LOV) for children treated using the clinical pathway. This was compared with LOV for all other ED visits during the study periods to highlight the effect of the clinical pathway implementation. Secondary outcome measures included rate of intravenous rehydration, unscheduled return visits to the ED and hospital admission., Results: During the three data collection periods, 11,816 children met the eligibility criteria. A decrease in the mean LOV of 24 min (95% CI 17 to 31) was observed, as well as a trivial decrease in the rate of intravenous rehydration therapy (14.6% to 12%) with implementation of the clinical pathway., Conclusion: The implementation of an oral rehydration clinical pathway in the ED led to a modest reduction in the ED LOV.

Objective: To evaluate the relationship between body mass index (BMI) and acute injury in adolescents., Methods: An analysis of cross-sectional data from the Canadian Community Health Survey (CCHS) Cycle 3.1 collected by Statistics Canada in 2005 was conducted. The CCHS is a population-based survey that collects information pertaining to the Canadian population health status, health care use and health determinants. The CCHS Cycle 3.1 included 132,221 respondents, of whom 12,317 were 12 to 17 years of age. Multivariate logistic regression was used to estimate the odds of injury occurrence by BMI categories (obese, overweight and neither)., Results: The association between overweight and obese BMI levels and injury occurrence in the bivariate model was not significant after adjusting for sex, health status, activity levels and socioeconomic status (OR=1.10 [95% CI 0.97 to 1.24] for overweight and OR=1.12 [95% CI 0.92 to 1.37] for obesity). A subanalysis of those with an injury in the past 12 months found an elevated odds of experiencing multiple injuries in the overweight group, after adjusting for age, health status and physical activity level (OR=1.43 [95% CI 1.16 to 1.77])., Conclusion: An increased risk of acute injury in obese and overweight adolescents was not observed. However, the subgroup analysis suggested that multiple injuries are relatively frequent in the overweight BMI group.