Table 4.

Descriptive Statistics for Cognitive Variables

Variable	N	M	SD	Minimum	Maximum
Speed of Processing
Digit Symbol Substitution (number)	894	40.04	11.66	0	74
Digit Symbol Copy (seconds)	891	106.48	43.14	51.07	613.25
Trails A (seconds)	893	45.07	26.87	14.61	480
Letter Comparison (number)	891	39.40	9.37	12	69
Pattern Comparison (number)	893	26.94	6.53	4	45
UFOV® (milliseconds)	890	877.53	290.15	302	2000
Executive Function
Trails B (seconds)	893	139.86	105.78	36.6	480
Stroop (seconds)	845	32.28	17.07	3.12	147.56
Memory
Digit Span (number)	894	9.55	2.13	4	16
Spatial Span (number)	894	7.39	1.77	0	13
HVLT (number)	894	23.35	5.58	0	36

Note. UFOV® = Useful Field of View test; HVLT = Hopkins Verbal Learning Test; variable units are listed in parentheses