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Similarly, clinical evidence indicates that adolescence is a risk factor for prolonged recovery, but the impact of age-at-injury on biomarkers has not been determined in large, homogeneous samples. The current study collected diffusion MRI data in consecutively recruited patients (n = 203; 8\u201318 years old) and age and sex-matched healthy controls (n = 170) in a prospective cohort design. Patients were evaluated subacutely (1\u201311 days post-injury) as well as at 4 months post-injury (early chronic phase). Healthy participants were evaluated at similar times to control for neurodevelopment and practice effects. Clinical findings indicated persistent symptoms at 4 months for a significant minority of patients (22%), along with residual executive dysfunction and verbal memory deficits. Results indicated increased fractional anisotropy and reduced mean diffusivity for patients, with abnormalities persisting up to 4 months post-injury. Multicompartmental geometric models indicated that estimates of intracellular volume fractions were increased in patients, whereas estimates of free water fractions were decreased. Critically, unique areas of white matter pathology (increased free water fractions or increased neurite dispersion) were observed when standard assumptions regarding parallel diffusivity were altered in multicompartmental models to be more biologically plausible. Cross-validation analyses indicated that some diffusion findings were more reproducible when \u223c70% of the total sample (142 patients, 119 controls) were used in analyses, highlighting the need for large-sample sizes to detect abnormalities. Supervised machine learning approaches (random forests) indicated that diffusion abnormalities increased overall diagnostic accuracy (patients versus controls) by \u223c10% after controlling for current clinical gold standards, with each diffusion metric accounting for only a few unique percentage points. In summary, current results suggest that novel multicompartmental models are more sensitive to paediatric mild traumatic brain injury pathology, and that this sensitivity is increased when using parameters that more accurately reflect diffusion in healthy tissue. Results also indicate that diffusion data may be insufficient to achieve a high degree of objective diagnostic accuracy in patients when used in isolation, which is to be expected given known heterogeneities in pathophysiology, mechanism of injury and even criteria for diagnoses. Finally, current results indicate ongoing clinical and physiological recovery at 4 months post-injury.<\/jats:p>","DOI":"10.1093\/brain\/awac221","type":"journal-article","created":{"date-parts":[[2022,6,21]],"date-time":"2022-06-21T18:36:32Z","timestamp":1655836592000},"page":"4124-4137","source":"Crossref","is-referenced-by-count":17,"title":["Multicompartmental models and diffusion abnormalities in paediatric mild traumatic brain injury"],"prefix":"10.1093","volume":"145","author":[{"given":"Andrew R","family":"Mayer","sequence":"first","affiliation":[{"name":"The Mind Research Network\/LBERI , Albuquerque, NM 87106 , USA"},{"name":"Department of Psychology, University of New Mexico , Albuquerque, NM 87131 , USA"},{"name":"Department of Neurology, University of New Mexico , Albuquerque, NM 87131 , USA"},{"name":"Department of Psychiatry and Behavioral Sciences, University of New Mexico , Albuquerque, NM 87131 , 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R","family":"Robertson-Benta","sequence":"additional","affiliation":[{"name":"The Mind Research Network\/LBERI , Albuquerque, NM 87106 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Erik B","family":"Erhardt","sequence":"additional","affiliation":[{"name":"Department of Mathematics and Statistics, University of New Mexico , Albuquerque, NM 87131 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robbert L","family":"Harms","sequence":"additional","affiliation":[{"name":"Maastricht , The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Timothy B","family":"Meier","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Medical College of Wisconsin , Milwaukee, WI 53226 , USA"},{"name":"Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin , Milwaukee, WI 53226 , USA"},{"name":"Department of Biomedical Engineering, Medical College of Wisconsin , Milwaukee, WI 53226 , 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