Table 1

ImPACT composite score calculations

ImPACT composite score	Calculation
Verbal memory	Average of these scores Word memory total per cent correct (immediate+delay)/2. Symbol match (hidden symbols)/9×100. Three letters total letters correct.
Visual memory	Average of the following scores Xs and 0s−total correct (interference) total/4. Design memory−total per cent correct (immediate+delay)/2.
Reaction time	Average of these scores Xs and 0s average correct RT. Symbol match average correct RT/3. Colour match average correct RT.
Processing speed	Average of the following scores Xs and 0s−total correct (interference) total/4. Three letters−average counted correctly×3.
Impulse control	Sum of the following scores Xs and 0s−total incorrect−interference. Colour match total commissions.

ImPACT, Immediate Post-Concussion Assessment and Cognitive Testing; RT, Reaction Time.