Table 1

Descriptive statistics of the healthy control subjects in the Iverson et al study³ (n = 56)

Test	M_x	M_y	M_y−M_x	SD_x	SD_y	r_xy	b_y.x	Standard errors
Test	M_x	M_y	M_y−M_x	SD_x	SD_y	r_xy	b_y.x	Expr 2	Expr 3	Expr 4
Expr, Expression; PSS, postconcussion symptom scale.
Verbal memory	88.68	88.84	0.16	9.50	8.09	0.70	0.60	7.36	6.83	6.94
Visual memory	78.70	77.48	−1.22	13.39	12.67	0.67	0.63	10.88	10.59	10.61
Reaction time	0.543	0.536	−0.007	0.087	0.063	0.79	0.57	0.056	0.049	0.054
Procession speed	40.54	42.24	1.70	7.64	7.06	0.86	0.79	4.04	3.89	3.93
PSS	5.23	5.79	0.56	6.75	10.07	0.65	0.97	5.65	7.17	7.66