Browsing by Author "Kelly, Louise A."

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    Bifactor Model of the Sport Concussion Assessment Tool Symptom Checklist: Replication and Invariance Across Time in the CARE Consortium Sample
    (Sage, 2020-09) Brett, Benjamin L.; Kramer, Mark D.; McCrea, Michael A.; Broglio, Steven P.; McAllister, Thomas; Nelson, Lindsay D.; Hazzard, Joseph B., Jr.; Kelly, Louise A.; Ortega, Justus; Port, Nicholas; Pasquina, Paul F.; Jackson, Jonathan; Cameron, Kenneth L.; Houston, Megan N.; Goldman, Joshua T.; Giza, Christopher; Buckley, Thomas; Clugston, James R.; Schmidt, Julianne D.; Feigenbaum, Luis A.; Eckner, James T.; Master, Christina L.; Collins, Michael W.; Kontos, Anthony P.; Chrisman, Sara P.D.; Duma, Stefan M.; Miles, Christopher M.; Susmarski, Adam; Psychiatry, School of Medicine
    Background: Identifying separate dimensions of concussion symptoms may inform a precision medicine approach to treatment. It was previously reported that a bifactor model identified distinct acute postconcussion symptom dimensions. Purpose: To replicate previous findings of a bifactor structure of concussion symptoms in the Concussion Assessment Research and Education (CARE) Consortium sample, examine measurement invariance from pre- to postinjury, and evaluate whether factors are associated with other clinical and biomarker measures. Study design: Cohort study (Diagnosis); Level of evidence, 2. Methods: Collegiate athletes were prospectively evaluated using the Sport Concussion Assessment Tool-3 (SCAT-3) during preseason (N = 31,557); 2789 were followed at <6 hours and 24 to 48 hours after concussion. Item-level SCAT-3 ratings were analyzed using exploratory and confirmatory factor analyses. Bifactor and higher-order models were compared for their fit and interpretability. Measurement invariance tested the stability of the identified factor structure across time. The association between factors and criterion measures (clinical and blood-based markers of concussion severity, symptom duration) was evaluated. Results: The optimal structure for each time point was a 7-factor bifactor model: a General factor, on which all items loaded, and 6 specific factors-Vestibulo-ocular, Headache, Sensory, Fatigue, Cognitive, and Emotional. The model manifested strict invariance across the 2 postinjury time points but only configural invariance from baseline to postinjury. From <6 to 24-48 hours, some dimensions increased in severity (Sensory, Fatigue, Emotional), while others decreased (General, Headache, Vestibulo-ocular). The factors correlated with differing clinical and biomarker criterion measures and showed differing patterns of association with symptom duration at different time points. Conclusion: Bifactor modeling supported the predominant unidimensionality of concussion symptoms while revealing multidimensional properties, including a large dominant General factor and 6 independent factors: Headache, Vestibulo-ocular, Sensory, Cognitive, Fatigue, and Emotional. Unlike the widely used SCAT-3 symptom severity score, which declines gradually after injury, the bifactor model revealed separable symptom dimensions that have distinct trajectories in the acute postinjury period and different patterns of association with other markers of injury severity and outcome. Clinical relevance: The SCAT-3 total score remains a valuable, robust index of overall concussion symptom severity, and the specific factors identified may inform management strategies. Because some symptom dimensions continue to worsen in the first 24 to 48 hours after injury (ie, Sensory, Fatigue, Emotional), routine follow-up in this time frame may be valuable to ensure that symptoms are managed effectively.
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    Estimated age of first exposure to American football and outcome from concussion
    (Wolters Kluwer, 2020-11-24) Caccese, Jaclyn B.; Houck, Zac; Kaminski, Thomas W.; Clugston, James R.; Iverson, Grant L.; Bryk, Kelsey N.; Oldham, Jessie R.; Pasquina, Paul F.; Broglio, Steven P.; McAllister, Thomas W.; McCrea, Michael; Reed Hoy, April Marie; Hazzard, Joseph B., Jr.; Kelly, Louise A.; Ortega, Justus D.; Port, Nicholas; Putukian, Margot; Langford, T. Dianne; Giza, Christopher C.; Goldman, Joshua T.; Benjamin, Holly J.; Schmidt, Julianne D.; Feigenbaum, Luis A.; Eckner, James T.; Mihalik, Jason P.; Dysart Miles, Jessica; Anderson, Scott; Master, Christina L.; Collins, Micky W.; Kontos, Anthony P.; Chrisman, Sara P.D.; Brooks, Alison; Jackson, Jonathan C.; McGinty, Gerald; Cameron, Kenneth L.; Susmarski, Adam; O'Donnell, Patrick G.; Duma, Stefan; Rowson, Steve; Miles, Christopher M.; Bullers, Christopher T.; Dykhuizen, Brian H.; Lintner, Laura; Buckley, Thomas A.; Psychiatry, School of Medicine
    Objective: To examine the association between estimated age at first exposure (eAFE) to American football and clinical measures throughout recovery following concussion. Methods: Participants were recruited across 30 colleges and universities as part of the National Collegiate Athletic Association (NCAA)-Department of Defense Concussion Assessment, Research and Education Consortium. There were 294 NCAA American football players (age 19 ± 1 years) evaluated 24-48 hours following concussion with valid baseline data and 327 (age 19 ± 1 years) evaluated at the time they were asymptomatic with valid baseline data. Participants sustained a medically diagnosed concussion between baseline testing and postconcussion assessments. Outcome measures included the number of days until asymptomatic, Immediate Post-Concussion Assessment and Cognitive Testing (ImPACT) composite scores, Balance Error Scoring System (BESS) total score, and Brief Symptom Inventory 18 (BSI-18) subscores. The eAFE was defined as participant's age at the time of assessment minus self-reported number of years playing football. Results: In unadjusted regression models, younger eAFE was associated with lower (worse) ImPACT Visual Motor Speed (R 2 = 0.031, p = 0.012) at 24-48 hours following injury and lower (better) BSI-18 Somatization subscores (R 2 = 0.014, p = 0.038) when the athletes were asymptomatic. The effect sizes were very small. The eAFE was not associated with the number of days until asymptomatic, other ImPACT composite scores, BESS total score, or other BSI-18 subscores. Conclusion: Earlier eAFE to American football was not associated with longer symptom recovery, worse balance, worse cognitive performance, or greater psychological distress following concussion. In these NCAA football players, longer duration of exposure to football during childhood and adolescence appears to be unrelated to clinical recovery following concussion.
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    Mechanisms of Injury Leading to Concussions in Collegiate Soccer Players: A CARE Consortium Study
    (Sage, 2024) Jo, Jacob; Boltz, Adrian J.; Williams, Kristen L.; Pasquina, Paul F.; McAllister, Thomas W.; McCrea, Michael A.; Broglio, Steven P.; Zuckerman, Scott L.; Terry, Douglas P.; CARE Consortium Investigators; Arbogast, Kristy; Benjamin, Holly J.; Brooks, Alison; Cameron, Kenneth L.; Chrisman, Sara P. D.; Clugston, James R.; Collins, Micky; DiFiori, John; Eckner, James T.; Estevez, Carlos; Feigenbaum, Luis A.; Goldman, Joshua T.; Hoy, April; Kaminski, Thomas W.; Kelly, Louise A.; Kontos, Anthony P.; Langford, Dianne; Lintner, Laura J.; Master, Christina L.; McDevitt, Jane; McGinty, Gerald; Miles, Chris; Ortega, Justus; Port, Nicholas; Rowson, Steve; Schmidt, Julianne; Susmarski, Adam; Svoboda, Steven; Psychiatry, School of Medicine
    Background: Few previous studies have investigated how different injury mechanisms leading to sport-related concussion (SRC) in soccer may affect outcomes. Purpose: To describe injury mechanisms and evaluate injury mechanisms as predictors of symptom severity, return to play (RTP) initiation, and unrestricted RTP (URTP) in a cohort of collegiate soccer players. Study design: Cohort study; Level of evidence, 2. Methods: The Concussion Assessment, Research and Education (CARE) Consortium database was used. The mechanism of injury was categorized into head-to-ball, head-to-head, head-to-body, and head-to-ground/equipment. Baseline/acute injury characteristics-including Sports Concussion Assessment Tool-3 total symptom severity (TSS), loss of consciousness (LOC), and altered mental status (AMS); descriptive data; and recovery (RTP and URTP)-were compared. Multivariable regression and Weibull models were used to assess the predictive value of the mechanism of injury on TSS and RTP/URTP, respectively. Results: Among 391 soccer SRCs, 32.7% were attributed to a head-to-ball mechanism, 27.9% to a head-to-body mechanism, 21.7% to a head-to-head mechanism, and 17.6% to a head-to-ground/equipment mechanism. Event type was significantly associated with injury mechanism [χ2(3) = 63; P < .001), such that more head-to-ball concussions occurred in practice sessions (n = 92 [51.1%] vs n = 36 [17.1%]) and more head-to-head (n = 65 [30.8%] vs n = 20 [11.1]) and head-to-body (n = 76 [36%] vs n = 33 [18.3%]) concussions occurred in competition. The primary position was significantly associated with injury mechanism [χ2(3) = 24; P < .004], with goalkeepers having no SRCs from the head-to-head mechanism (n = 0 [0%]) and forward players having the least head-to-body mechanism (n = 15 [19.2%]). LOC was also associated with injury mechanism (P = .034), with LOC being most prevalent in head-to-ground/equipment. Finally, AMS was most prevalent in head-to-ball (n = 54 [34.2%]) and head-to-body (n = 48 [30.4%]) mechanisms [χ2(3) = 9; P = .029]. In our multivariable models, the mechanism was not a predictor of TSS or RTP; however, it was associated with URTP (P = .044), with head-to-equipment/ground injuries resulting in the shortest mean number of days (14 ± 9.1 days) to URTP and the head-to-ball mechanism the longest (18.6 ± 21.6 days). Conclusion: The mechanism of injury differed by event type and primary position, and LOC and AMS were different across mechanisms. Even though the mechanism of injury was not a significant predictor of acute symptom burden or time until RTP initiation, those with head-to-equipment/ground injuries spent the shortest time until URTP, and those with head-to-ball injuries had the longest time until URTP.
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    Postinjury Outcomes After Non-Sport-Related Concussion: A CARE Consortium Study
    (Allen Press, 2024) Roby, Patricia R.; Mozel, Anne E.; Arbogast, Kristy B.; Buckley, Thomas; Caccese, Jaclyn B.; Chrisman, Sara P. D.; Clugston, James R.; Eckner, James T.; Esopenko, Carrie; Hunt, Tamerah; Kelly, Louise A.; McDevitt, Jane; Perkins, Susan M.; Putukian, Margot; Susmarski, Adam; Broglio, Steven P.; Pasquina, Paul F.; McAllister, Thomas W.; McCrea, Michael; Master, Christina L.; CARE Consortium Investigators; Psychiatry, School of Medicine
    Context: Concussion research has primarily focused on sport-related mechanisms and excluded non-sport-related mechanisms. In adult populations, non-sport-related concussions (non-SRCs) demonstrated worse clinical outcomes compared with sport-related concussions (SRCs); however, investigations of non-SRCs in college-aged patients are limited. Objectives: To examine clinical outcomes in collegiate athletes with non-SRCs compared with SRCs and explore sex differences in outcomes among collegiate athletes with non-SRCs. Design: Prospective cohort study. Setting: Clinical setting. Patients or other participants: A total of 3500 athletes were included (n = 555 with non-SRCs, 42.5% female) from colleges or universities and service academies participating in the National Collegiate Athletic Association Department of Defense Concussion Assessment, Research and Education (CARE) Consortium. Main outcome measure(s): Dichotomous outcomes (yes or no) consisted of immediate reporting, mental status alterations, loss of consciousness, posttraumatic amnesia, retrograde amnesia, motor impairments, delayed symptom presentation, and required hospital transport. Continuous outcomes were symptom severity, days with concussion symptoms, and days lost to injury. Data were collected within 24 to 48 hours of injury and at return to play. Adjusted relative risks (ARRs) compared the likelihood of dichotomous outcomes by mechanism and by sex within patients with non-SRCs. Multivariate negative binomial regressions were used to assess group differences in continuous variables. Results: Athletes with non-SRCs were less likely to report immediately (ARR = 0.73, 95% CI = 0.65, 0.81) and more likely to report delayed symptom presentation (ARR = 1.17, 95% CI = 1.03, 1.32), loss of consciousness (ARR = 3.15, 95% CI = 2.32, 4.28), retrograde amnesia (ARR = 1.77, 95% CI = 1.22, 2.57), and motor impairment (ARR = 1.45, 95% CI = 1.14, 1.84). Athletes with non-SRCs described greater symptom severity, more symptomatic days, and more days lost to injury (P < .001) compared with those who had SRCs. Within the non-SRC group, female athletes indicated greater symptom severity, more symptomatic days, and more days lost to injury (P < .03) than male athletes. Conclusions: Athletes with non-SRCs had worse postinjury outcomes compared with those who had SRCs, and female athletes with non-SRCs had worse recovery metrics than male athletes. Our findings suggest that further investigation of individuals with non-SRCs is needed to improve concussion reporting and management.
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    Sex Differences Across Concussion Characteristics in US Service Academy Cadets: A CARE Consortium Study
    (Springer, 2024) Kelly, Louise A.; Caccese, J. B.; Jain, D.; Master, C. L.; Lempke, L.; Memmini, A. K.; Buckley, T. A.; Clugston, J. R.; Mozel, A.; Eckner, J. T.; Susmarski, A.; Ermer, E.; Cameron, K. L.; Chrisman, S.; Pasquina, P.; Broglio, S. P.; McAllister, T. W.; McCrea, M.; Esopenko, C.; CARE Consortium Investigators; Psychiatry, School of Medicine
    Objective: To describe sex differences in concussion characteristics in US Service Academy cadets. Design: Descriptive epidemiology study. Setting: Four US service academies. Participants: 2209 cadets (n = 867 females, n = 1342 males). Independent variable: Sex. Outcome measures: Injury proportion ratios (IPR) compared the proportion of injuries by sex (females referent) for injury situation, certainty of diagnosis, prolonged recovery, recurrent injuries, mental status alterations, loss of consciousness (LOC), posttraumatic amnesia (PTA), retrograde amnesia (RGA), motor impairments, delayed symptom presentation, and immediate reporting. Main results: Concussions from varsity/intercollegiate sports [IPR of 1.73, 95% confidence interval (CI) 1.43-2.10] and intramurals (IPR of 1.53, 95% CI 1.02-2.32) accounted for a larger proportion in males, whereas concussions outside of sport and military activities accounted for a smaller proportion among males (IPR of 0.70, 95% CI 0.58-0.85). The proportion of concussions with prolonged recovery was lower among males (IPR of 0.69, 95% CI 0.60-0.78), while concussions with altered mental status (IPR of 1.23, 95% CI 1.09-1.38), LOC (IPR of 1.67, 95% CI 1.17-2.37), PTA (IPR of 1.94, 95% CI 1.43-2.62), and RGA (IPR of 2.14, 95% CI 1.38-3.31) accounted for a larger proportion among males. A larger proportion of concussions that were immediately reported was observed in males (IPR of 1.15, 95% CI 1.00-2.31). Proportions of other characteristics (e.g., recurrent injuries) were not different between sexes. Conclusions: A higher proportion of concussions occurred outside of sport and military training for female cadets, who also displayed proportionally longer recovery times than males, despite males demonstrating a higher proportion of LOC, PTA, and RGA. Possible factors may include different mechanisms of injury outside of sport and military training, different biopsychosocial states associated with sex or injury context, and delayed injury reporting when outside of an observed environment, possibly secondary to perceived stigma about reporting injuries.