Table 4.

Means and standard deviations for the three cognitive domains at each time point across the TBI severity groups.

Group	Months Post-injury	N	Processing Speed/Executive Function	Memory	Verbal Fluency
Controls	1 mo.	66	0.14 ± 0.69	−0.16 ± 0.95	−0.23 ± 0.75
	6 mo.	58	0.33 ± 0.77	0.22 ± 1.07	−0.20 ± 0.75
	12 mo.	50	0.42 ± 0.75	0.43 ± 0.94	−0.10 ± 0.77
Mild TBI	1 mo.	28	−0.51 ± 0.94	−0.58 ± 0.91	−0.81 ± 0.90
	6 mo.	27	0.01 ± 0.83	−0.07 ± 0.90	−0.55 ± 0.69
	12 mo.	26	−0.03 ± 0.81	−0.07 ± 1.09	−0.57 ± 0.84
Complicated Mild TBI	1 mo.	24	−0.85 ± 1.10	−0.87 ± 1.37	−0.88 ± 0.97
	6 mo.	21	−0.16 ± 0.80	−0.07 ± 0.93	−0.63 ± 0.78
	12 mo.	17	−0.06 ± 0.85	−0.14 ± 1.01	−0.47 ± 0.72
Moderate to Severe TBI	1 mo.	57	−2.13 ± 0.80	−2.46 ± 1.05	−2.01 ± 0.58
	6 mo.	46	−0.96 ± 0.78	−1.01 ± 1.14	−1.25 ± 0.72
	12 mo.	40	−0.65 ± 0.89	−0.96 ± 1.16	−1.10 ± 0.60

NOTE. Values are averaged z-scores presented as mean ± SD. Of those that completed the visit, the following numbers of subjects were excluded from specific domains because they were missing >50% of the variables for the domain: At 1-month post-injury, 1 was excluded from Processing Speed/Executive Function, 7 were excluded from Verbal Fluency, and 2 were excluded from Memory. At 6-months post-injury, 1 was excluded from Memory.