Table 2.

Means and standard deviations (s.d.) of transformed composite scores

Z-scores	N	Mean	s.d.
ImPACT Verbal Memory	54	−0.013	1.005
ImPACT Visual Memory	54	−0.029	0.986
ImPACT Visual Motor
Speed	54	0.001	1.009
ImPACT Reaction Time	54	−0.013	1.005
NP Verbal Memory	54	0.004	0.856
NP Visual Memory	33	0.094	0.770
NP Processing Speed	54	0.164	0.517
NP Reaction Time	54	0.305	0.638