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Clifford A Robbins,1 Daniel H Daneshvar,1,2 John D Picano,1,3 Brandon E Gavett,1,4 Christine M Baugh,1,2 David O Riley,1 Christopher J Nowinski,1,2,5 Ann C McKee,1,2,6–8 Robert C Cantu,1,5,9,10 Robert A Stern1,2,8,91Center for the Study of Traumatic Encephalopathy, 2Department of Neurology, Boston University School of Medicine, Boston, MA, USA; 3School of Medicine and Biomedical Sciences, University of Buffalo, Buffalo, NY, USA; 4Department of Psychology, University of Colorado, Colorado Springs, CO, USA; 5Sports Legacy Institute, Waltham MA, USA; 6United States Department of Veterans Affairs, VA Boston Healthcare System, Boston, MA, USA; 7Department of Pathology, 8Alzheimer's Disease Center, 9Department of Neurosurgery, Boston University School of Medicine, Boston, MA, USA; 10Department of Neurosurgery, Emerson Hospital, Concord, MA, USABackground: In recent years, the understanding of concussion has evolved in the research and medical communities to include more subtle and transient symptoms. The accepted definition of concussion in these communities has reflected this change. However, it is unclear whether this shift is also reflected in the understanding of the athletic community.What is known about the subject: Self-reported concussion history is an inaccurate assessment of someone's lifetime exposure to concussive brain trauma. However, unfortunately, in many cases it is the only available tool.Hypothesis/purpose: We hypothesize that athletes' self-reported concussion histories will be significantly greater after reading them the current definition of concussion, relative to the reporting when no definition was provided. An increase from baseline to post-definition response will suggest that athletes are unaware of the currently accepted medical definition.Study design: Cross-sectional study of 472 current and former athletes.Methods: Investigators conducted structured telephone interviews with current and former athletes between January 2010 and January 2013, asking participants to report how many concussions they had received in their lives. Interviewers then read participants a current definition of concussion, and asked them to re-estimate based on that definition.Results: The two estimates were significantly different (Wilcoxon signed rank test: z=15.636, P

We present the steps taken to produce a reliable and complete input galaxy catalogue for the Dark Energy Spectroscopic Instrument (DESI) Bright Galaxy Survey (BGS) using the photometric Legacy Survey DR8 DECam. We analyse some of the main issues faced in the selection of targets for the DESI BGS, such as star-galaxy separation, contamination by fragmented stars and bright galaxies. Our pipeline utilizes a new way to select BGS galaxies using Gaia photometry and we implement geometrical and photometric masks that reduce the number of spurious objects. The resulting catalogue is cross-matched with the Galaxy And Mass Assembly (GAMA) survey to assess the completeness of the galaxy catalogue and the performance of the target selection. We also validate the clustering of the sources in our BGS catalogue by comparing with mock catalogues and the Sloan Digital Sky Survey (SDSS) data. Finally, the robustness of the BGS selection criteria is assessed by quantifying the dependence of the target galaxy density on imaging and other properties. The largest systematic correlation we find is a 7 per cent suppression of the target density in regions of high stellar density.

Background: Youth sports coaches play a critical role in proper concussion recognition and management, reinforcing the need for coach concussion education. As of 2021, most states have statutory and policy measures mandating concussion education for coaches. In practice, these mandates have been enacted through state legislatures and their respective youth sport governing bodies. Prior studies have found significant variations in the contents of state-level concussion risk reduction policies and have raised questions about their specificity., Objective: To expand on previous analyses to provide an overview of youth sports coach concussion education, highlighting variations in state policies and discrepancies between state mandates and youth sport governing bodies., Methods: This report utilized qualitative content analysis to characterize and compare U.S. state and governing body concussion education requirements for youth sport coaches. State concussion statutes were identified via the National Conference of State Legislatures and Open States databases, and governing body handbooks/bylaws were obtained via their websites. Two researchers independently coded the policies, and discrepancies were resolved through consensus meetings with additional youth traumatic brain injury experts., Results: We found significant variability in educational requirements and their implementation. A majority (68%; n = 34) of states require the completion of concussion education training for coaches. Notably, many states designate responsibility for enforcement and implementation of provisions to another party but just four state statutes delineate explicit consequences for noncompliance. Additionally, only 12 state statutes extend mandates to noninterscholastic sports, limiting their reach. In most cases, independent sanctioning authorities implement more stringent policies than the minimum acceptable standard established by state law., Conclusion: Our findings provide a coded data set of youth coach concussion laws and independent sanctioning authority guidelines that can be used in future research efforts. Further research investigating a relationship between the strength of coach concussion education policies and relevant youth and adolescent concussion-related metrics is required., (© 2024 American Academy of Physical Medicine and Rehabilitation.)

Objectives: Evaluate professional rugby players' self-reported perceived understanding of the head injury assessment (HIA) and return to play (RTP) processes and determine factors related to understanding and trust pertaining to these processes., Methods: An electronic survey measured concepts of interest. A thematic analysis of player understanding was performed, and player statements were coded., Results: 207 U.S. Major League Rugby (MLR) players participated (26.7 ± 3.4 years). HIA and RTP protocol understanding was not correlated with concussion history ( p  = 0.41). International rugby experience and trust regarding MLR support of the following protocols and opposing team medical staff practices varied in their relationship to HIA understanding. Trust that all MLR teams follow the same protocols was positively correlated with all HIA questions (ps < 0.03). No HIA questions were correlated with trust in their own team's medical staff. All trust questions were significantly correlated with RTP process understanding. Qualitative analysis identified four HIA- and RTP-related themes: education needs, staffing needs, HIA criticisms, and importance of player safety., Conclusion: International playing experience and greater trust in the MLR and league stakeholders were associated with greater player understanding of the HIA and RTP protocols. These results provide insight into the importance of educating players on league-specific concussion protocols.

Objective: To investigate dizziness, vestibular/oculomotor symptoms, and cervical spine proprioception among adults with/without a concussion history., Methods: Adults ages 18-40 years with/without a concussion history completed: dizziness handicap inventory (DHI), visio-vestibular exam (VVE), and head repositioning accuracy (HRA, assesses cervical spine proprioception). Linear regression models were used to assess relationships between (1) concussion/no concussion history group and VVE, HRA, and DHI, and (2) DHI with HRA and VVE for the concussion history group., Results: We enrolled 42 participants with concussion history (age = 26.5 ± 4.5 years, 79% female, mean = 1.4± 0.8 years post-concussion) and 46 without (age = 27.0± 3.8 years, 74% female). Concussion history was associated with worse HRA (β = 1.23, 95% confidence interval [CI]: 0.77, 1.68; p < 0.001), more positive VVE subtests (β = 3.01, 95%CI: 2.32, 3.70; p < 0.001), and higher DHI scores (β = 9.79, 95%CI: 6.27, 13.32; p < 0.001) after covariate adjustment. For the concussion history group, number of positive VVE subtests was significantly associated with DHI score (β = 3.78, 95%CI: 2.30, 5.26; p < 0.001) after covariate adjustment, while HRA error was not (β = 1.10, 95%CI: -2.32, 4.51; p = 0.52)., Conclusions: Vestibular/oculomotor symptom provocation and cervical spine proprioception impairments may persist chronically (i.e., 3 years) after concussion. Assessing dizziness, vestibular/oculomotor and cervical spine function after concussion may inform patient-specific treatments to address ongoing dysfunction., Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Research reported in this work was supported by the Children's Hospital Colorado Research Institute, the Eunice Kennedy Shriver National Institute of Child Health & Human Development (R01HD108133), and the National Institute of Health (T32AR080630). Unrelated to this study, Dr. Howell has received research support from the Eunice Kennedy Shriver National Institute of Child Health & Human Development (R03HD094560), the National Institute of Neurological Disorders And Stroke (R01NS100952, R43NS108823), the National Institute of Arthritis and Musculoskeletal and Skin Diseases (1R13AR080451), the Denver Broncos Foundation, and the Colorado Clinical and Translational Sciences Institute (UL1 TR002535‐05)., (Copyright © 2024 Elsevier Ltd. All rights reserved.)

Background: Concussions are mild traumatic brain injuries that are often undiagnosed due to difficulties in identifying symptoms. To minimize the negative sequelae associated with undiagnosed concussion, efforts have targeted improving concussion reporting. However, knowing more about concussions does not indicate how likely an athlete is to report their concussion. Alternatively, the attitudes and beliefs of athletes and surrounding stakeholders have shown to be a better indication of whether an athlete intends to report their concussion. Prior research has shown that athletes report concussions less often when the injury is described using language that minimizes their severity, such as when it is referred to as a "ding." This study evaluated whether describing concussions using the word "brain" was associated with individuals' underlying attitudes and beliefs about the injury's severity., Objective: To measure the relationship between perceived concussion severity and the language used to describe concussions, specifically whether participants used the word "brain" in describing the injury., Methods: One-on-one semi-structured telephone interviews were conducted, and a cross sectional secondary qualitative analysis was performed to assess participants' perceived concussion severity and their use of the word "brain" to describe concussions., Design: Cross-sectional secondary qualitative analysis., Setting: One-on-one semistructured telephone interviews., Participants: In 2017, 94 individuals involved in high school sports, including athletes, coaches, educators, parents of athletes, and athletic directors were recruited via convenience sampling., Main Outcome Measures: Respondents' perceived severity of concussions., Results: Individuals who used a brain phrase to describe concussion also perceived concussions as more severe (p < .001). Specifically, those who described concussions with maximum severity had higher odds of using brain phrases than those who described concussions as having minimum (odds ratio [OR] = 0.05, 95% confidence interval [CI] = 0.002-0.299, p < .001) or moderate severity (OR = 0.24, 95% CI = 0.086-0.647, p = .003), with the most significant relationship found among coaches., Conclusions: These findings demonstrate the relationship between medical terminology and perceived severity of concussions. This relationship may play a role in concussion reporting behavior for coaches, athletes, and parents. Education programs using similar medical terminology may promote concussion reporting behaviors., (© 2024 American Academy of Physical Medicine and Rehabilitation.)

Importance: Sponsorship of promotional events for health professionals is a key facet of marketing campaigns for pharmaceuticals and medical devices; however, there appears to be limited transparency regarding the scope and scale of this spending., Objective: To develop a novel method for describing the scope and quantifying the spending by US pharmaceutical and medical companies on industry-sponsored promotional events for particular products., Design and Setting: This was a cross-sectional study using records from the Centers for Medicare & Medicaid's Open Payments database on payments made to prescribing clinicians from January 1 to December 21, 2022., Main Outcomes and Measures: An event-centric approach was used to define sponsored events as groupings of payment records with matching variables. Events were characterized by value (coffee, lunch, dinner, or banquet) and number of attendees (small vs large). To test the method, the number of and total spending for each type of event across professional groups were calculated and used to identify the top 10 products related to dinner events. To validate the method, we extracted all event details advertised on the websites of 4 state-level nurse practitioner associations that regularly hosted industry-sponsored dinner events during 2022 and compared these with events identified in the Open Payments database., Results: A total of 1 154 806 events sponsored by pharmaceutical and medical device companies were identified for 2022. Of these, 1 151 351 (99.7%) had fewer than 20 attendees, and 922 214 (80.0%) were considered to be a lunch ($10-$30 per person). Seven companies sponsored 16 031 dinners for the top 10 products. Of the 227 sponsored in-person dinner events hosted by the 4 state-level nurse practitioner associations, 168 (74.0%) matched events constructed from the Open Payments dataset., Conclusions and Relevance: These findings indicate that an event-centric analysis of Open Payments data is a valid method to understand the scope and quantify spending by pharmaceutical and medical device companies on industry-sponsored promotional events attended by prescribers. Expanding and enforcing the reporting requirements to cover all payments to all registered health professionals would improve the accuracy of estimates of the true extent of all sponsored events and their impact on clinical practice.

Background: Approximately 20% of the United States' population lives in a state or jurisdiction where medical aid in dying (MAiD) is legal. It is unknown how physicians' own barriers are associated with their provision of the spectrum of MAiD services., Objective: To measure physicians' religious and/or ethical barriers to providing MAiD services and how such barriers relate to physicians' intentions and behaviors., Design: Three-wave cross-sectional survey fielded in Colorado in 2020-2021., Participants: Physicians providing care to patients likely clinically eligible for MAiD according to probabilistic sampling., Main Measures: Physicians self-reported barriers to their own participation in MAiD. We considered large ethical and/or religious barriers to be conscience-based barriers. We measured physicians' self-reported intention to participate and self-reported prior participation in MAiD since it was legalized in Colorado in 2017. We estimated differences in intention and behavior outcomes according to presence of conscience-based barriers, adjusting for physician gender, race/ethnicity, time in practice, and specialty., Key Results: Among 300 respondents, 26% reported "large" ethical and/or religious barriers to their involvement in MAiD. Physicians with longer time in practice and those identifying as non-White were more likely to report conscience-based barriers to MAiD. Comparing physicians with and without conscience-based barriers to MAiD, we found no difference in ancillary participation (discussing, referring) but significant differences in direct participation (serving as consultant [5% vs. 31%] or attending [0% vs. 22%])., Conclusions: Approximately one-quarter of physicians likely to care for MAiD-eligible patients in Colorado reported religious and/or ethical barriers to MAiD. Despite religious and/or ethical barriers, the vast majority of physicians were willing to discuss MAiD and/or refer patients seeking MAiD services. These data provide important empirical foundation for policy from hospitals and health systems as well as medical specialty groups with official positions on MAiD., (© 2024. The Author(s), under exclusive licence to Society of General Internal Medicine.)

Background: The pharmaceutical industry promotes prescribing through the cultivation of key opinion leaders. Advanced practice nurses (APNs) are a growing and influential group of prescribers across generalist and specialty practice. Public reporting of industry payments to APNs allows for exploration of their influence within practice settings., Objective: To understand the characteristics of APNs with top industry payments including their positions of influence and other payment recipients at the same address., Design and Setting: Cross-sectional study of US national Open Payments reports of industry payments made between January 1, 2021, and December 31, 2021., Participants: APNs who received > $50,000 USD in industry payments for speaking, consulting, and honoraria ("personal fees")., Measures: Description of top APN recipients' practice setting type, clinical specialty, presence of other payment recipients, value of payments attributed to the same address, and top manufacturers and therapeutic categories associated with payments to top APN recipients. Structured content analysis of public-facing websites for evidence of APNs' clinical, research, and teaching leadership., Results: A total of 99 APNs received > $50,000 USD in aggregate personal fees and a median $74,080 USD (IQR $57,303-101,702) in aggregate payments. They shared a practice setting with a median of 1 (IQR 0-5) physician and 0 (IQR 0-3) other APN payment recipients and were often the only (39%, 42/109) or the dominant (45%, 30/67) payment recipient in their practice setting. In total, 36% held clinical leadership positions, 25% led scientific research, and 18% had university appointments. Forty-two percent (37/88) owned a clinical practice, including cosmetic clinics (51%, 19/37) and mental/behavioral health clinics (24%, 9/37)., Conclusions: Top APN payment recipients attracted high-value payments in practice settings and specialities associated with high-cost drug development; however, there may be little oversight of APNs' industry relationships. Policy development related to industry relationships must be inclusive of and responsive to the activities of interprofessional providers., (© 2023. The Author(s), under exclusive licence to Society of General Internal Medicine.)

Background: There is limited data regarding how clinicians operationalize shared decision-making (SDM) with athletes with cardiovascular diagnoses. This study was designed to explore sports cardiologists' conceptions of SDM and approaches to sports eligibility decisions., Methods: 20 sports cardiologists were interviewed by telephone or video conference from October 2022 to May 2023. Qualitative descriptive analysis was conducted with the transcripts., Results: All participants endorsed SDM for eligibility decisions, however, SDM was defined and operationalized heterogeneously. Only 6 participants specifically referenced eliciting patient preferences during SDM. Participants described variable roles for the physician in SDM and variable views on athletes' understanding, perception, and tolerance of risk. Participants thresholds for prohibitive annual risk of sudden cardiac death ranged from <1 % to >10 %., Conclusions: These findings reinforce the general acceptance of SDM for sports eligibility decisions and highlight the need to better understand this process and identify the most effective approach for operationalization., Competing Interests: The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Dr. Dickert reports consulting and research funding from Abiomed, Inc. and research funding from NIH and AHRQ. Dr. Baggish receives compensation for his role as consultant / team cardiologist from the US Olympic Committee / US Olympic Training Centers, International Olympic Committee, National Football League Players Association, US Soccer, and US Rowing. Dr. Campbell has served as a paid expert witness on law cases related to financial conflicts of interest in medicine. The other authors report no conflicts., (© 2024 The Authors.)

Context: The abrupt cessation of school and sport participation during the COVID-19 pandemic may have negative implications for adolescent mental health., Objectives: To (1) compare mental, physical, and social health and behaviors during pandemic-related stay-at-home mandates with the same measures collected 1 to 2 years earlier and (2) evaluate the relationships between physical activity and sleep during the pandemic and changes in anxiety, fatigue, and peer relationships between assessment times., Design: Cohort study., Setting: Pediatric sports medicine center., Patients or Other Participants: A total of 39 high school athletes (25 adolescent girls, 14 adolescent boys; age = 16.2 ± 0.9 years)., Main Outcome Measure(s): Patient-Reported Outcome Measurement System anxiety, fatigue, and peer relationships short forms and the Pittsburgh Sleep Quality Index were completed twice (initial assessment in May 2018 or 2019, follow-up assessment in May or June 2020). Frequency and duration of physical activity and frequency of interaction with other individuals (family, peers, sport coaches, etc) were self-reported at follow-up assessment for the 2 weeks before school or sport closure and the 2 weeks before questionnaire completion., Results: Higher levels of anxiety (5.5 ± 4.0 versus 3.6 ± 3.4 points; P = .003) and fatigue (5.4 ± 3.7 versus 2.3 ± 2.5 points; P < .001) and worse sleep quality (6.6 ± 2.9 versus 4.3 ± 2.3 points; P < .001) were observed during the pandemic compared with previous assessments. Reductions in physical activity were noted between assessments (exercise duration: 86.4 ± 41.0 versus 53.8 ± 30.0 minutes; P < .001). Sleep quality but not physical activity during the pandemic predicted changes in fatigue (P = .03, β = 0.44 [95% CI = 0.06, 0.83]) and peer relationships (P = .01, β = -0.65 [95% CI = -1.16, -0.15]) from initial to follow-up assessment., Conclusions: Mental and physical health declined during stay-at-home mandates compared with assessments 1 to 2 years earlier. Physical activity behaviors and sources of social interaction underwent changes after school and sport cessation. Sleep quality may have provided some protection against declining adolescent mental health during the pandemic, although this relationship requires further investigation., (© by the National Athletic Trainers’ Association, Inc.)

Enabling athletes to achieve peak performances while also maintaining high levels of health is contextually complex. We aim to describe what a 'health system' is and apply the essential functions of stewardship, financing, provision of services and resource generation to an Australian high-performance sport context. We introduce a fifth function that health systems should not detract from athletes' ability to achieve their sports goals. We describe how these functions aim to achieve four overall outcomes of safeguarding the health of the athletes, responding to expectations, providing financial and social protection against the costs of ill health, and efficient use of resources. Lastly, we conclude with key challenges and potential solutions for developing an integrated health system within the overall performance system in high-performance sport., (© 2023. Crown.)

Chronic traumatic encephalopathy (CTE) is a neurodegenerative tauopathy associated with repetitive head impacts (RHI), but the components of RHI exposure underlying this relationship are unclear. We create a position exposure matrix (PEM), composed of American football helmet sensor data, summarized from literature review by player position and level of play. Using this PEM, we estimate measures of lifetime RHI exposure for a separate cohort of 631 football playing brain donors. Separate models examine the relationship between CTE pathology and players' concussion count, athletic positions, years of football, and PEM-derived measures, including estimated cumulative head impacts, linear accelerations, and rotational accelerations. Only duration of play and PEM-derived measures are significantly associated with CTE pathology. Models incorporating cumulative linear or rotational acceleration have better model fit and are better predictors of CTE pathology than duration of play or cumulative head impacts alone. These findings implicate cumulative head impact intensity in CTE pathogenesis., (© 2023. The Author(s).)

This manuscript uses competitive college football as a lens into the complexities of decision-making amid the Covid-19 pandemic. Pulling together what is known about the decision-makers, the decision-making processes, the social and political context, the risks and benefits, and the underlying obligations of institutions to these athletes, we conduct an ethical analysis of the decisions surrounding the 2020 fall football season. Based on this ethical analysis, we provide key recommendations to improve similar decision processes moving forward.

Background: While healthcare and health outcome disparities have been studied across a variety of different injuries, their relation to concussion incidence and management are relatively understudied., Aim: The aim of this study was to evaluate the association between history of concussion or musculoskeletal injury, and family affluence and/or school-level measures of socioeconomic status., Methods: We conducted a cross-sectional study of adolescent athletes in a local school district. Adolescent athletes ( n = 192; mean age = 15.3, SD = 1.6 years; 49% female), who presented for a pre-participation physical evaluation reported concussion and injury history, and family affluence scale (FAS) scores. We also examined the percent of students on free/reduced lunch at each school compared to state averages. Independent variables, individual FAS score and school-based marker of socioeconomic status, were compared between those with and without a history of concussion and time-loss musculoskeletal injury., Results: Of the participants, 40 (21%) reported a history of concussion. Athletes with a concussion history had significantly lower FAS scores than athletes without a history of concussion (mean difference = 0.7, 95%CI = 0.1, 1.4; P = 0.027). There was no significant difference in FAS scores between those with and without a history of time-loss musculoskeletal injury (mean difference = 0.0, 95% CI = -0.5, 0.5; P = 0.97). Athletes with a history of concussion had a higher proportion of a prior time-loss musculoskeletal injury (68% vs. 32%; P < 0.001). After adjusting for age, school free-reduced lunch rate, and history of musculoskeletal injury, a lower FAS score was associated with concussion history (adjusted odds ratio = 0.79; 95% CI = 0.64, 0.96; P = 0.019). Concussion and musculoskeletal injury were not associated with school-level markers of socioeconomic status., Conclusion: Lower individual measures, but not school-level measures, of socioeconomic status were associated with a history of concussion in our sample of adolescent athletes., Relevance for Patients: Enhance providers' understanding of how socioeconomic factors may impact concussion history and empower providers to adequately screen for and provide concussion education to mitigate disparities., Competing Interests: The authors have no conflicts of interest relevant to this article to disclose., (Copyright: © 2022 Author(s).)

Background: Concussion underreporting is endemic, and social norms are an established predictor of concussion reporting behavior. However, pluralistic ignorance-a situation in which most individuals in a group hold the belief that their peers' views differ from their own, despite views actually being similar-has not been studied in this context., Aim: To assess whether pluralistic ignorance contributes to concussion underreporting., Method: We surveyed 2,504 military service academy cadets. Each cadet was presented with a survey asking about their willingness to self-report a concussion, their perception of other cadets' willingness to report a concussion, and personal and demographic factors., Results: Most cadets viewed themselves as more willing to report a concussion than others (mean difference = 1.12, 95% CI [1.02, 1.21]), a belief consistent with pluralistic ignorance. Demographic characteristics were associated with holding this belief. For example, female cadets and upper-class cadets were more likely to show this disparity than male or under-class cadets, respectively. Collegiate athletes not only showed similar willingness to report concussion as nonathletes but also perceived other cadets as less likely to report concussions. Meanwhile, future pilots showed less self-report willingness and perceived that others were similarly unwilling to report concussions., Discussion: A majority of this economically and geographically diverse population displays characteristics of pluralistic ignorance: They largely share proconcussion reporting sentiments but incorrectly perceive that others do not. This belief is not held uniformly in all subpopulations, which may inform how these beliefs are developed and maintained., Conclusions: Pluralistic ignorance is an important consideration in concussion education efforts.

Undiagnosed concussions increase the risk of additional concussion and persistent symptoms from concussion. Because there are no reliable objective markers of concussion, self-reporting of subjective and non-visible symptoms are critical to ensuring proper concussion management. For this reason, educational interventions target concussion reporting, but the majority of studies have examined the efficacy of single educational interventions or compared interventions to one another. This randomized crossover study sought to identify whether there was benefit to administering multiple concussion education programs in tandem, back to back. The study randomized 313 male high school football players to first receive CrashCourse concussion education (CC) or Centers for Disease Control and Prevention video concussion education (CDC) followed by crossover with the other education. Athlete concussion-reporting intention, attitudes, subjective norms, perceived behavioral control, and enjoyment of education were assessed at baseline and after each intervention. There were statistically significant improvements across all measures, both after single intervention and crossover (all p  < 0.001). Secondary analyses examining differences between education found that athletes reported higher enjoyment of concussion education immediately after participating in CC, as compared to CDC ( p  < 0.001). These findings demonstrate an additive benefit to implementing CC and CDC education in tandem, without decrement in enjoyment of concussion education after experiencing dual educations; in fact, enjoyment of concussion education improved after receiving education programs back to back. These educational programs appear to complement one another, and the results support the use of multi-modal concussion education to differentially target and maximize concussion reporting., Competing Interests: P.S. is founder and CEO for the non-profit, TeachAids, where she receives a salary of $1 per year. The following authors have a non-reimbursed relationship as medical advisors for CrashCourse: D.H.D., M.Y., R.D.P., S.G., G.A.G., J.G., and L.M.S. C.M.B. previously received funding from the NCAA as a graduate student research grant recipient, the Datalys Center for Sports Injury Research and Prevention as a graduate student research grant recipient, and through the Football Players' Health Study at Harvard, which is funded by the NFL Players' Association. R.C. is a paid consultant to the NFL Head Neck and Spine Committee, NOCSAE, Concussion Legacy Foundation, royalties from book publications, and compensation from expert legal opinion. He is a member of the Mackey-White Committee of the NFL Players Association. R.Z. serves on scientific advisory boards for Oxeia BioPharma, ElMIndA, and MYOMO; serves on the editorial board of Journal of Neurotrauma; receives publishing royalties for Brain Injury Medicine: Principles and Practice (Demos, 2013) and Physical Medicine and Rehabilitation—A Comprehensive Review (Oakstone); and receives research support from the NIH, NIDILRR, USARMC, and the Football Players Health Study at Harvard funded, in part, by the NFL Players' Association., (© Daniel H. Daneshvar et al., 2021; Published by Mary Ann Liebert, Inc.)

Importance: Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disease; understanding ALS risk factors is a critical public health issue., Objectives: To evaluate the incidence of and mortality from ALS in National Football League (NFL) athletes and to describe characteristics associated with ALS within this cohort., Design, Setting, and Participants: This population-based cohort study included all 19 423 NFL athletes who debuted between 1960 and 2019 and played 1 or more professional game. It was conducted between October 3, 2020, and July 19, 2021., Exposure: Participation in the NFL, including playing 1 or more professional games., Main Outcomes and Measures: Cases of ALS and death information were identified based on public records from NFL statistics aggregators, news reports, obituaries, and National Death Index results. The standardized incidence ratio and the standardized mortality ratio were calculated based on data acquired from surveillance studies of ALS accounting for age, sex, and race. Secondary analyses examined the association of body mass index, NFL career duration, race, birth location, and markers of fame, using a nested case-control design, matching athletes with ALS to athletes without ALS, by NFL debut year., Results: A total of 19 423 male former and current NFL players (age range, 23-78 years) were included in this cohort study and were followed up for a cumulative 493 168 years (mean [SD] follow-up, 30.6 [13.7] years). Thirty-eight players received a diagnosis of ALS, and 28 died during the study time frame, representing a significantly higher incidence of ALS diagnosis (standardized incidence ratio, 3.59; 95% CI, 2.58-4.93) and mortality (standardized mortality ratio, 3.94; 95% CI, 2.62-5.69) among NFL players compared with the US male population, adjusting for age and race. Among NFL athletes, nested-case-control analyses found that those who received a diagnosis of ALS had significantly longer careers (mean [SD] duration, 7.0 [3.9] years) than athletes without ALS (mean [SD] duration, 4.5 [3.6] years; odds ratio, 1.2; 95% CI, 1.1-1.3). There were no differences in ALS status based on proxies of NFL fame, body mass index, position played, birth location, or race., Conclusions and Relevance: The age-, sex-, and race-adjusted incidence of and mortality from ALS among all NFL players who debuted between 1960 and 2019 were nearly 4 times as high as those of the general population. Athletes with a diagnosis of ALS had longer NFL careers than those without ALS, suggesting an association between NFL duration of play and ALS. The identification of these risk factors for ALS helps to inform the study of pathophysiological mechanisms responsible for this fatal neurodegenerative disease.

Objective: This report estimates the percent of medically eligible adolescents who are referred for metabolic and bariatric surgery (MBS) evaluation or factors associated with referral., Methods: This cross-sectional retrospective review evaluated patients aged 13 to 18 years seen between 2017 and 2019 for demographics, insurance status, body mass index (BMI), obesity-related comorbidities, and compared these data to patients whom had been referred and received MBS., Results: Half of the patients (86 411/163137, 53%) between ages of 13 and 18 years identified had BMI documented, of which, 1974 (2.3%) were medically eligible for MBS, 238 (12%) were referred for MBS and 52 (22%) underwent MBS. Females had similar odds of being eligible for MBS [odds ratio (OR) = 1.01, 95% confidence interval (CI) 0.92-1.11, P = .9], but greater odds of referral (OR = 1.58, 95% CI 1.13-2.23, P = .009). Independently, miniorities and patients with public insurance had higher odds of being eligible for MBS, but similar odds of being referred as non-Hispanic white patients. Black patients with public insurance had greater odds of being referred for MBS (OR = 12.22, 95% CI 2.08-235.15, P = .022). Patients' multiple comorbidities had greater odds of being referred for MBS (OR = 2.16, 95% CI 1.29-3.68, P = .004)., Conclusions: Referral is barrier for patients medically eligible for MBS; however, this barrier is not uniformly faced by all patients., (© 2021 World Obesity Federation.)

Context: Concussion underreporting leads to delays in diagnosis and treatment, prolonging recovery time. Athletes' self-reporting of concussion symptoms, therefore, reduces risk., Objective: To evaluate the effectiveness of 3 concussion-education programs in improving concussion-reporting intention., Design: Randomized controlled clinical trial., Setting: Three high schools in California., Patients or Other Participants: A total of 118 male football players (age = 14.88 ± 1.19 years)., Intervention(s): Participants were randomly assigned to receive concussion education via CrashCourse (CC), Centers for Disease Control and Prevention (CDC) video education materials (CDC-Vi), or CDC written education materials (CDC-Wr)., Main Outcome Measure(s): The primary outcome was concussion-reporting intention, which was assessed at baseline, immediately after education, and at 1-month follow-up. Secondary outcomes were concussion knowledge, concussion-reporting attitudes, perceived concussion-reporting norms, and perceived behavioral control., Results: Across all education formats, a total sample of athletes improved in concussion-reporting intention at immediate and 1-month follow-ups (mean improvements = 6.8% and 11.4%, respectively; F4,224 = 11.1, P < .001). Similar findings were observed across all education formats in secondary analyses examining knowledge, attitudes, and perceived behavioral control. However, we noted differences in concussion-reporting intention by education format and time (F4,224 = 2.8, P = .03). Post hoc analysis showed that athletes who received CC had increased concussion-reporting intentions at immediate and 1-month follow-ups (baseline = 4.7, immediate follow-up = 6.1, 1-month follow-up = 6.0; F16,61.1 = 6.1, P = .007) compared with increases only at 1-month follow-up for CDC-Vi (baseline = 4.3, immediate follow-up = 5.2, 1-month follow-up = 5.8; F1.6,61.6 = 8.4, P = .001) and no improvement for CDC-Wr (P = .10). Secondary analyses indicated differences between CC and both CDC interventions in concussion knowledge and attitudes at immediate and 1-month follow-ups. We identified no differences in perceived behavioral control among interventions (F4,216 = 0.2, P = .93) or perceived concussion-reporting norms across (F4,224 = 0.3, P = .73) or among (F4,224 = 1.7, P = .15) interventions., Conclusions: All athletes exhibited an improved intent to report concussions, increased concussion knowledge, better concussion attitudes, and more perceived behavioral control at both immediate and 1-month follow-ups. However, athletes randomized to receive CC reported a greater intent to report concussion, more knowledge, and improved concussion-reporting attitudes when compared with those who received CDC-Vi and CDC-Wr., (© by the National Athletic Trainers' Association, Inc.)

Background: Football participation is associated with risks to acute and long-term health, including the possibility of incurring football-related dementia. Concerns have been raised regarding media coverage of these risks, which may have influenced athletes' beliefs. However, little is known about football players' views on football-related dementia. The risk-perception literature suggests that related risk perceptions and features of individual cognition, such as the ability to switch to reasoned, deliberative thinking, may influence individual perception of a long-term risk., Purpose: To evaluate factors influencing college football players' belief that they are likely to incur football-related dementia in the future., Study Design: Cross-sectional study., Methods: Members of 4 National Collegiate Athletic Association Division I Power 5 Football teams participated in this survey-based study, providing responses to demographic, athletic, and risk-posture questions, and completed the cognitive reflection test. Logistic regressions were used to evaluate relationships between beliefs about football-related dementia and factors including athletic and demographic characteristics, football risk posture, health-risk posture, and cognitive reflection test score., Results: About 10% of the 296 participating athletes thought football-related dementia was likely to occur in their future. Skill players had lower odds than linemen of believing that football-related dementia was likely (odds ratio [OR], 0.35; 95% CI, 0.14-0.89). For each additional suspected concussion in an athlete's career, his odds of believing football-related dementia was likely increased by 24% (OR, 1.24; 95% CI, 1.07-1.45). Acute and chronic football-related risk perceptions, as well as non-football-related health-risk perceptions, were positively associated with athletes' belief that football-related dementia was likely. Higher cognitive reflection test scores, a measure of ability to switch to slow, deliberative thinking, was positively associated with odds of believing football-related dementia was likely (OR, 1.57; 95% CI, 1.12-2.21)., Conclusion: Some athletes view football as generally riskier, while others view football as generally lessri sky. These risk postures are informed by athletes' concussion history, primary playing position, and ability to switch from fast, reactive thinking to slow, deliberative thinking. Ensuring that athletes are appropriately informed of the risks of participation is an ethical obligation of universities; sports medicine clinicians are appropriate facilitators of conversations about athletes' health risks., Competing Interests: One or more of the authors has declared the following potential conflict of interest or source of funding: Research reported in this publication was supported by the National Institute of Mental Health of the National Institutes of Health (award No. T32MH019733). This work was also conducted with the support of the Football Players Health Study at Harvard; the Football Players Health Study is funded by a grant from the National Football League Players Association (NFLPA). The content of this article is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health, Harvard Medical School, Harvard University or its affiliates, or the NFLPA. E.K. is a paid consultant of the National Collegiate Athletic Association, contributing to health education program development, and has received funding through the Pac-12 Conference. AOSSM checks author disclosures against the Open Payments Database (OPD). AOSSM has not conducted an independent investigation on the OPD and disclaims any liability or responsibility relating thereto., (© The Author(s) 2021.)

Undiagnosed concussions increase risk of additional injuries and can prolong recovery. Because of the difficulties recognizing concussive symptoms, concussion education must specifically target improving athlete concussion reporting. Many concussion education programs are designed without significant input from athletes, resulting in a less enjoyable athlete experience, with potential implications on program efficacy. Athlete enjoyment of previous concussion education programs moderates the improvement in concussion-reporting intention after experiencing the research version of CrashCourse (CC) concussion education. Prospective cohort study. Level of evidence: Level IV. Quantitative assessment utilizing ANOVA with moderation analysis of 173 male high school football players, aged 13 to 17, who completed baseline assessments of concussion knowledge, concussion reporting, and attitudes about prior educational interventions. Athletes were subsequently shown CC, before a follow-up assessment was administered assessing the same domains. At baseline, only 58.5% of athletes reported that they enjoyed their previous concussion education. After CC, athletes were significantly more likely to endorse that they would report a suspected concussion (from 69.3% of athletes to 85.6%; P  < .01). Enjoyment of previous concussion education moderated concussion-reporting intention after CC ( P  = .02), with CC having a greater effect on concussion-reporting intention in athletes with low enjoyment of previous concussion education ( b  = 0.21, P  = .02), than on individuals with high enjoyment of previous concussion education ( P  = .99). Enjoyment of CC did not have a moderating effect on concussion-reporting intention. Athletes who previously did not enjoy concussion education exhibited greater gains in concussion-reporting intention than athletes who enjoyed previous education. Given the potential risks associated with undiagnosed concussions, concussion education has sought to improve concussion reporting. Because most athletes participate in concussion education programs due to league or state mandates, improving concussion-reporting intention in these low-enjoyment athletes is of particular relevance to improving concussion-reporting intention broadly.

Importance: Despite increased concern about the health consequences of contact sports, little is known about athletes' understanding of their own risk of sports-related injury., Objective: To assess whether college football players accurately estimate their risk of concussion and nonconcussion injury and to identify characteristics of athletes who misestimate their injury risk., Design, Setting, and Participants: In this survey study, questionnaires were given to 296 current college football players on 4 teams from the 3 of the 5 most competitive conferences of the US National Collegiate Athletic Association. Surveys were conducted between February and May 2017. Data were analyzed from June 2017 through July 2020., Main Outcomes and Measures: Multiple approaches were taken to compare athlete perceptions of their risks of concussion and nonconcussion injury with individual probabilities of these risks, which were modeled using logistic regression., Results: Of 296 male college-aged athletes from 4 football teams who participated in the survey, 265 (89%) answered all questions relevant for this study. Participating teams were similar to nonparticipating teams across nearly all measured characteristics. One hundred athletes (34%) had sustained 1 or more concussions, and 197 (68% of the 289 who responded to the question) had sustained 1 or more injuries in the previous football season. Logistic regression models of single-season injury and concussion had reasonably good fit (area under the curve, 0.75 and 0.73, respectively). Of the 265 participants for whom all relevant data were available, 111 (42%) underestimated their risk of concussion (χ2 = 98.6; P = .003). A similar proportion of athletes (113 [43%]) underestimated their risk of injury, although this was not statistically significant (χ2 = 34.0; P = .09). An alternative analytic strategy suggested that 241 athletes (91%) underestimated their risk of injury (Wilcoxon statistic, 7865; P < .001) and 167 (63%) underestimated their risk of concussion (Wilcoxon statistic, 26 768; P < .001)., Conclusions and Relevance: The findings of this survey study suggest that college football players may underestimate their risk of injury and concussion. The implications for informed participation in sport are unclear given that people generally underestimate health risks. It is necessary to consider whether athletes are sufficiently informed and how much risk is acceptable for an athlete to participate in a sport.

Context: A growing number of high-school-aged athletes participate on club sport teams. Some, but not all, state concussion laws apply to both interscholastic and private sport organizations. However, concussion education, management plans, and knowledge have not been examined in club coaches who coach high school-aged athletes., Objective: To determine if differences in concussion education, management plans, and knowledge exist between high school coaches and coaches of club sport teams., Design: Cross-sectional study., Setting: Online survey., Patients or Other Participants: A total of 769 coaches (497 high school coaches, 272 club coaches coaching high school-aged athletes; 266 women [34.6%], 503 men [65.4%]) completed an anonymous online questionnaire., Main Outcome Measure(s): The questionnaire consisted of demographic and team information, requirements for concussion-education and -management plans, and concussion knowledge., Results: High school coaches were more likely than club coaches to report that their organizing bodies or leagues required them to receive concussion-education information (97.4% versus 80.4%; P < .001) and that their organizing bodies or leagues had a concussion-management plan (94.0% versus 70.2%; P < .001). High school coaches were more likely than club coaches to correctly agree that most concussions resolve in 7 to 10 days (48.6% versus 40.1%; P = .02) and disagree that loss of consciousness is required to diagnose a concussion (87.1% versus 80.9%; P = .02)., Conclusions: Club coaches were less likely to be aware of requirements for concussion-education and -management plans from their parent organizations and scored lower on specific concussion-knowledge questions than high school coaches despite the same education requirements across groups under their state concussion laws. These results raise concerns regarding the proper management of concussions in club sports and suggest a need for greater oversight and enforcement of state laws in the club sport setting., (© by the National Athletic Trainers' Association, Inc.)

Context: The relative availability of clinicians as well as the types and training of health care providers have been associated with morbidity and mortality in non-athletic health care settings. Whether staffing variations are associated with injury incidence in collegiate athletes is unknown., Objective: To evaluate whether the institutional ratio of athletes to athletic trainers (patient load) or the ratio of staff to nonstaff (graduate assistant and certified intern) athletic trainers or both is associated with the incidence of injuries sustained by male ice hockey athletes at the school., Design: Descriptive epidemiology study., Setting: National Collegiate Athletic Association (NCAA) men's ice hockey teams., Patients or Other Participants: Collegiate men's ice hockey athletes., Main Outcome Measure(s): The NCAA Injury Surveillance Program collected data from collegiate men's ice hockey athletes. Staffing patterns were obtained through telephone interviews. Injury counts, injury rates per 1000 athlete-exposures, and injury rate ratios with 95% confidence intervals were calculated and compared between the following groups: (1) schools with high (versus low) patient load and (2) schools with high (versus low) ratio of staff to nonstaff (graduate assistant and certified intern) athletic trainers., Results: Both the patient load and relative number of staff athletic trainers were associated with variations in the incidences and types of diagnosed injuries in male ice hockey players. Specifically, fewer injuries were diagnosed by clinicians at institutions with high patient loads. The rates of injury overall and non-time-loss injuries were lower in the high patient-load group. Time-loss injury rates, severe injury rates, concussion rates, and overall rates of injury during competition were greater in the group with a higher proportion of staff athletic trainers, whereas non-time-loss injury rates were lower., Conclusions: In this study of collegiate men's ice hockey players, athlete health outcomes were directly related to the number and types of clinicians available. Future researchers should evaluate whether this finding extends beyond men's ice hockey., (© by the National Athletic Trainers' Association, Inc.)

Context: Structural features of health care environments are associated with patient health outcomes, but these relationships are not well understood in sports medicine., Objective: To evaluate the association between athlete injury outcomes and structural measures of health care at universities: (1) clinicians per athlete, (2) financial model of the sports medicine department, and (3) administrative reporting structure of the sports medicine department., Design: Descriptive epidemiology study., Setting: Collegiate sports medicine programs., Patients or Other Participants: Colleges that contribute data to the National Collegiate Athletic Association (NCAA) Injury Surveillance Program., Main Outcome Measure(s): We combined injury data from the NCAA Injury Surveillance Program, sports medicine staffing data from NCAA Research, athletic department characteristics from the United States Department of Education, and financial and administrative oversight model data from a previous survey. Rates of injury, reinjury, concussion, and time loss (days) in NCAA athletes., Results: Compared with schools that had an average number of clinicians per athlete, schools 1 standard deviation above average had a 9.5% lower injury incidence (103.6 versus 93.7 per 10000 athlete-exposures [AEs]; incidence rate ratio [IRR] = 0.905, P < .001), 2.7% lower incidence of reinjury (10.6 versus 10.3 per 10000 AEs; IRR = 0.973, P = .004), and 6.7% lower incidence of concussion (6.1 versus 5.7 per 10000 AEs; IRR = 0.933, P < .001). Compared with the average, schools that had 1 standard deviation more clinicians per athlete had 16% greater injury time loss (5.0 days versus 4.2 days; IRR = 1.16, P < .001). At schools with sports medicine departments financed by or reporting to the athletics department (or both), athletes had higher injury incidences (31% and 9%, respectively)., Conclusions: The financial and reporting structures of collegiate sports medicine departments as well as the number of clinicians per athlete were associated with injury risk. Increasing the number of sports medicine clinicians on staff and structuring sports medicine departments such that they are financed by and report to a medical institution may reduce athlete injury incidence., (© by the National Athletic Trainers' Association, Inc.)

Context: The ratio of clinicians to patients has been associated with health outcomes in many medical contexts but has not been explored in collegiate sports medicine. The relationship between administrative and financial oversight models and staffing is also unknown., Objective: To (1) evaluate staffing patterns in National Collegiate Athletic Association sports medicine programs and (2) investigate whether staffing was associated with the division of competition, Power 5 conference status, administrative reporting structure (medical or athletic department), or financial structure (medical or athletic department)., Design: Cross-sectional study., Setting: Collegiate sports medicine programs., Patients or Other Participants: Representatives of 325 universities., Main Outcome Measure(s): A telephone survey was conducted during June and July 2015. Participants were asked questions regarding the presence and full-time equivalence of the health care providers on their sports medicine staff. The number of athletes per athletic trainer was determined., Results: Responding sports medicine programs had 0.5 to 20 full-time equivalent staff athletic trainers (median = 4). Staff athletic trainers at participating schools cared for 21 to 525 athletes per clinician (median = 100). Both administrative and financial oversight from a medical department versus the athletics department was associated with improved staffing across multiple metrics. Staffing levels were associated with the division of competition; athletic trainers at Division I schools cared for fewer athletes than athletic trainers at Division II or III schools, on average. The support of graduate assistant and certified intern athletic trainers varied across the sample as did the contributions of nonphysician, nonathletic trainer health care providers., Conclusions: In many health care settings, clinician : patient ratios are associated with patient health outcomes. We found systematic variations in clinician : patient ratios across National Collegiate Athletic Association divisions of competition and across medical versus athletics organizational models, raising the possibility that athletes' health outcomes vary across these contexts. Future researchers should evaluate the relationships between clinician : patient ratios and athletes' access to care, care provision, health care costs, health outcomes, and clinician job satisfaction., (© by the National Athletic Trainers' Association, Inc.)

Sports medicine clinicians face conflicts of interest in providing medical care to athletes. Using a survey of college football players, this study evaluates whether athletes are aware of these conflicts of interest, whether these conflicts affect athlete trust in their health care providers, or whether conflicts or athletes' trust in stakeholders are associated with athletes' injury reporting behaviors.

Athletes sometimes choose not to report suspected concussions, risking delays in treatment and health consequences. How and why do athletes make these reporting decisions? Using original survey data from a cohort of college football players, we evaluate two assumptions of the current literature on injury reporting: first, that the probability of reporting a concussion or injury is constant over time; second, that athletes make reasoned deliberative decisions about whether to report their concussion or other injury. We find that athletes are much less likely to report a concussion to a medical professional than they are to report another injury (47% vs. 80%), but no association between reporting and a measure of athletes' ability to switch from fast, reactive thinking to reasoned, deliberative thinking. The likelihood of reporting decreases as the number of injuries and concussions increases, and no athlete reported more than four concussions. Sports medicine clinicians sometimes use four concussions as a time to discuss possibly curtailing sports participation, which may influence athletes' subsequent reporting behavior. Sports medicine clinicians may want to consider athlete injury history as a risk factor for concussion and injury under-reporting.