Table I.

Descriptive variables for controls and patients

	Controls		Patients
	Mean	SD	Mean	SD	F	P
Age (yrs)	39.82	10.54	41.38	8.04	t = −0.66	0.51
Education (1–7)	5.46	1.73	5.15	1.42	Z = −0.29	0.77
NGMV (l)	0.85	0.05	0.82	0.04	7.27	<0.01
NWMV (l)	0.69	0.04	0.66	0.03	11.89	<0.01
NBV (l)	1.54	0.07	1.48	0.06	12.38	<0.01
Executive Functioning (Z)	0.03	0.70	−0.25	1.06	1.08	0.30
Verbal Memory (Z)	0.03	0.79	−0.49	1.10	2.32	0.13
Information Processing (Z)	0.01	1.08	−0.14	1.37	0.37	0.55
Visuospatial Memory (Z)	0.09	1.13	−0.04	0.90	0.42	0.52
Working Memory (Z)	0.10	0.91	−0.50	1.05	4.25	0.04
Attention (Z)	0.10	0.52	−0.34	0.80	7.36	0.01
Psychomotor Speed (Z)	0.02	0.83	−0.21	1.19	0.87	0.36
EDSS (1–10)a			2	(0−4.5)
T1 volume (ml)			1.11	1.68
T2 volume (ml)			2.48	2.83
T1/T2 ratio			0.43	0.19

NGMV, normalized gray matter volume; NWMV, normalized white matter volume; NBV, normalized brain volume; EDSS, expanded disability status scale.

^aIndicates median and range.