Highlights
- •ImPACT can be used serially over a one-hour period.
- •Neurocognitive scores did not differ across administrations.
- •A small percentage of scores were outside RCI cutoffs, suggesting sufficient one-hour reliability.
Abstract
Background
Computerized Neurocognitive Testing (CNT) is frequently used for serial assessment
of athletes following concussion. The Immediate Post-Concussion Assessment for Cognitive
Testing (ImPACT) is a commonly used CNT with well-documented test–retest reliability
in healthy samples for intervals ranging from one month to two years. However, previous
research has not explored use of ImPACT for other serial testing methodologies such
as immediately before and after an experimental trial/intervention where administration
on the same day may be necessary.
Purpose
To examine the suitability of ImPACT for short-term, serial assessment of neurocognitive
functioning.
Study design
Prospective, repeated measures research design.
Methods
Forty-two healthy, college-aged individuals completed ImPACT twice, with a one-hour
break between assessments. Reliability was assessed using Pearson correlation coefficients,
intraclass correlation coefficients (ICCs), reliable change indices (RCIs) and regression-based
methods (RBM).
Results
No significant increases in mean ImPACT composite or symptom scores were observed
between assessments. ICCs ranged from 0.34 to 0.74 (single)/0.51 to 0.85 (average).
Across two test administrations, 92–100% and 93–98% of participants' change scores
fell within cutoffs when utilizing the RCI and RBM, respectively.
Conclusion
The ICCs for ImPACT composite and factor scores across the one-hour administration
were consistent with previous studies. Only a small percentage of scores fell outside
of RCI and RBM cutoffs. These statistical metrics suggest that ImPACT has sufficient
reliability when repeating administration within one-hour.
Keywords
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Article info
Publication history
Published online: November 21, 2018
Accepted:
November 12,
2018
Received:
October 9,
2018
Identification
Copyright
© 2018 Elsevier Ltd. All rights reserved.
