Table 2.

Subject characteristics

Characteristica	n = 209
Age, years	80.2 (7.2)
Female, n (%)	154 (74 %)
Education, years	15.2 (2.9)
Mini-Mental State Examination (MMSE) score, /30	28.9 (1.2)
Perceptual speed score	0.371 (0.642)
Episodic memory score	0.602 (0.494)
Semantic memory score	0.438 (0.526)
Working memory score	0.335 (0.648)
Visuospatial ability score	0.420 (0.594)
Total gray matter volume, (tenths of % ICV)	339.6 (41.4)
Total WMH volume (% ICV)b	0.89 % (0.91 %)
Total WMH volume (% ICV), after logarithmc	−0.24 (0.40)

^aMean (SD), unless otherwise specified

^b WMH white matter hyperintensities; values expressed as  % of intracranial volume

^cLogarithm, base 10; used in regression models