Intraindividual cognitive variability before and after sports-related concussion.

Abstract:

OBJECTIVE:Inconsistent performance is associated with cognitive dysfunction in a number of clinical populations. However, intraindividual cognitive variability in healthy individuals is poorly understood. Inconsistency poses a challenge to clinicians when interpreting change over time. This study examined intraindividual cognitive variability within a sample of college athletes tested at baseline and postconcussion. METHOD:Athletes (n = 71) and control participants (n = 42) were tested with a comprehensive neuropsychological battery at baseline and postconcussion (athletes) or one month later (controls). A subset of indices with high internal consistency was used to calculate overall performance and performance variability. A k-means cluster analysis of baseline and postconcussion performance variability examined heterogeneity within the sample. RESULTS:In the athlete sample, performance variability was significantly greater than zero, and was negatively correlated with overall performance at both time points (p < .001). Wechsler Test of Adult Reading Full Scale IQ estimate was significantly correlated with overall performance (p < .01), but not with performance variability. Cluster analysis revealed low-variability (n = 46) and high-variability (n = 25) cluster groups. Whereas the low-variability cluster group exhibited a pattern of performance similar to that of control participants, membership in the high-variability cluster group was associated with postconcussion cognitive dysfunction. CONCLUSION:These findings suggest that normative cognitive performance in college athletes is characterized by significant intraindividual variation across tests. Cross-test intraindividual variability may impart clinically meaningful information, as higher levels of variability were related to poorer overall performance and postconcussion cognitive dysfunction.

journal_name

Neuropsychology

journal_title

Neuropsychology

authors

Rabinowitz AR,Arnett PA

doi

10.1037/a0033023

subject

Has Abstract

pub_date

2013-07-01 00:00:00

pages

481-490

issue

4

eissn

0894-4105

issn

1931-1559

pii

2013-25138-008

journal_volume

27

pub_type

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