The Two-Factor Score (speed and memory) provides an additional summary score approach for interpretation of the test data. Research has shown that in addition to the existing four Composite Scores that have historically been used to describe the ImPACT test results, a Two-Factor Score can also provide a valid approach to interpreting the data. In addition, this research has shown that the two-factor structure has improved test-retest reliability with no loss of sensitivity/specificity and may improve understanding and interpretability of ImPACT test results. This increased reliability is likely a result of more items included in each factor, thus possibly reducing error.
For an in-depth explanation of clinical report interpretation, including two-factor scores, take the ImPACT Clinical Report Interpretation course.