Table 2.

Baseline Cognitive Performance of Study Participants (N = 49)

Cognitive Test	Mean	SD	T-scorea	Level of Impairment
Digit Span
Digits Forward	8.90	2.10
Digits Backward	5.84	2.36
Digits Total	14.74	4.46	43	Low Average
Digit Symbol
Total Correct	54.53	17.39	40	Low Average
California Verbal Learning Test
Total Correct, Trials 1–5	41.61	11.85	36	Mildly Impaired
Total Correct, Delayed Recall	8.10	3.38	31	Mildly Impaired
Wisconsin Card Sorting Test
Total Categories Obtained	2.20	2.27	34	Mildly Impaired
Percent Perseverative Errors	33.68	21.20	22	Moderately Impaired

^aBased on population norms, average t=50, SD=10