Barker-Collo, STheadom, AJones, KAmeratunga, SFeigin, VStarkey, NDudley, MKahan, M2016-10-062016-10-0620162016JSM Burns Trauma 1(1): 1006.https://hdl.handle.net/10292/10066Objective: Post concussive syndromes (PCS) is common after mild-TBI, yet are not well studied on a population level. This study examined PCS symptoms, including reliable change over time in a population-based sample up to one year post-TBI. Methods: Prospective follow-up of 527 adults (≥16 years) with mild TBI (mTBI) and assessment data (Rivermead Post concussion Questionnaire; RPQ) at baseline, 1, 6, and/or 12-months post-TBI. Change in mean scores and clinically significant change across RPQ items for each person was calculated between assessment time points using a reliable change index (RCI). Results: While prevalence of all symptoms reduced over time, >30% of participants reported fatigue, slowed thinking, and forgetfulness 12-months postinjury. Using the RCI, <12% of individuals improved from baseline to 1-month, 50% from 1 to 6-months, and 4.2% from 6 to 12-months. Conclusions: Improvements in PCS post-mTBI were most obvious between 1 and 6-months, suggesting lengthy recovery trajectory. A third of patients experience residual cognitive problems 12-months following a mTBI, and while many individuals improve post-TBI, a large proportion remain stable or worsen.Open Access Publication by JSciMed Central® is licensed under a Creative Commons Attribution 4.0 International License. Based on a work at https://jscimedcentral.com/. Permissions beyond the scope of this license may be available at https://creativecommons.org/.Post concussive symptoms; Mild brain injury; Reliable change; LongitudinalJournal ArticleOpenAccess