I have a baseline in Desktop ImPACT and just did the follow up using Online ImPACT. Can I compare them?
Yes, the data can be directly compared. Within this context, there are slight variations in the data when comparing the online to desktop versions. More specifically, the reaction time scores are slightly different between the two systems, whereas the other composite scores (Verbal Memory, Visual Memory, Visual-Motor Speed scores) are nearly equivalent. The best way to directly compare data between the two systems is to use the normative data and percentile scores for comparison, rather than the raw scores. In this fashion, the data is identical as you are using the same metric for comparison. As norms are based upon comparisons to a normal population, the data are similarly converted to this common metric and percentile. Thus, for example, if someone scored .52 on the desktop version and is at the 51st percentile, this would be equivalent to someone scoring at .56 and at the 51st percentile for the online system. Using percentile scores rather than raw scores allow for a direct compar
