Quantifying a Minimal Detectable Change within World Rugby's Head Injury Assessment protocol for elite rugby: a longitudinal observational cohort study.

Objective Within World Rugby's Head Injury Assessment (HIA) protocol for elite rugby union, if a player scores one worse than his/her baseline, it is deemed an abnormal test. This analysis aims to quantify year-to-year test-retest reliability and establish a minimal detectable change (MDC) from the Sports Concussion Assessment Tool (SCAT) baseline testing that is used within the HIA protocol. Methods SCAT baseline and clinical data are captured by World Rugby's SCRM App and database for professional men's and women's global domestic competitions. Baseline and clinical data were linked on a uni

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