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Minimal Detectable Change for the ImPACT Test Administered Remotely.

Kristen G Quigley¹, Madison R Taylor¹, Dustin Hopfe¹

¹Neuromechanics Laboratory, School of Public Health, University of Nevada, Reno.

Journal of Athletic Training

|November 17, 2022

Summary

Remote ImPACT testing shows reliable neurocognitive scores for athletes. The minimal detectable change (MDC) provides a guide for concussion assessment, ensuring accurate clinical judgments when testing is done at home.

Keywords:

concussion neurocognitive assessment student-athletes traumatic brain injury

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Area of Science:

Sports Medicine
Neuroscience
Clinical Assessment

Background:

Immediate Postconcussion Assessment and Cognitive Testing (ImPACT) is a widely used tool for assessing athletes' cognitive function.
Administering ImPACT remotely is increasingly common, but its impact on test-retest reliability remains unclear.

Purpose of the Study:

To determine the minimal detectable change (MDC) for ImPACT composite scores in student-athletes tested remotely before two consecutive seasons.
To establish reliability benchmarks for unsupervised, at-home ImPACT testing.

Main Methods:

A cross-sectional study analyzed remote ImPACT baseline data from NCAA Division I student-athletes across two athletic seasons.
Minimal detectable change (MDC) was calculated at 95%, 90%, and 80% confidence intervals for ImPACT composite scores.

Main Results:

The 95% CI MDC values varied across composite scores, with verbal memory at 18.6 and visual memory at 24.44.
Reaction time showed a low MDC of 0.14, while impulse control was 6.13.
Statistical analyses indicated no significant differences in composite scores or impulse control between the two remote testing periods.

Conclusions:

ImPACT composite scores and impulse control remain stable when administered remotely approximately one year apart.
The calculated MDC values are valuable for clinicians evaluating changes in ImPACT scores and making concussion-related clinical decisions for remotely tested athletes.