A five year comparative analysis of annual baseline neurocognitive test scores for South African high school athletes

Abstract

The primary objective of this study was to assess the pattern of change in neurocognitive performance for adolescent athletes on baseline measures of the Immediate Post Concussion Assessment and Cognitive Testing (ImPACT) test, over five consecutive years, with a view to providing an indication of the optimal interval for repeat baseline testing of high school athletes. Participants were non-clinical, predominantly South African high school athletes in the overall age range 13 to 18 years (N = 108), divided into five groups (Grades 8,9, 10, 11 and 12), and tested at five test intervals. Repeated-measures ANOVA analyses examined differences in score performance across the test intervals for each of the five composite scores of the ImPACT test (Verbal Memory, Visual Memory, Visual Motor Speed, Reaction Time, Impulse Control). For the Verbal Memory, Visual Memory, Visual Motor Speed and Reaction Time composites there were significant neurocognitive score changes between several test intervals. Taking these results into account, in conjunction with substantial variability in performance, it is concluded that there is a need for annual baseline testing throughout the high school years. The secondary objective was to generate normative tables (Means and Standard Deviations) on the ImPACT test for the five participant groups at each of the five test intervals, including data for: the five composite scores (Verbal Memory, Visual Memory, Visual Motor Speed, Reaction Time, Impulse Control); for the twelve subtest scores test that go to make up the composite scores; and for four additional memory subcomponent scores (Word Memory immediate recall, Word Memory delayed recall, Design Memory immediate recall, Design Memory delayed recall). The results provide a clinical and heuristic normative platform for future use with brain injured individuals, which can be used to facilitate clinical interpretations of postconcussion assessments.