. Author manuscript; available in PMC: 2011 Jan 24.

Published in final edited form as: Arch Neurol. 2010 Nov;67(11):1379–1385. doi: 10.1001/archneurol.2010.280

Table 2.

Volumes used to determine the percentage of white matter at risk

Region	WMH volume, cm³	WM volume, cm³	WMHp^a
Total	8.8 (5.3, 15.5) [1.3 to 62.1]	333 (301, 370) [228 to 449]	3 (2, 5) [0 to 14]
Periventricular	5.6 (3.4, 9.2) [1.0 to 25.7]	44 (40, 48) [30 to 57]	12 (8, 22) [2 to 48]
Subcortical	3.1 (1.6, 6.3) [0.2 to 36.3]	290 (258, 321) [196 to 394]	1 (1, 2) [0 to 10]
Frontal	2.4 (1.3, 5.1) [0.2 to 27.8]	141 (127, 155) [98 to 202]	2 (1, 4) [0 to 17]
Temporal	1.4 (0.9, 2.1) [0.1 to 6.5]	62 (56, 69) [27 to 87]	2 (2, 4) [0 to 10]
Parietal	1.9 (0.8, 4.4) [0.1 to 20.4]	86 (76, 96) [55 to 116]	2 (1, 6) [0 to 20]
Occipital	2.6 (1.6, 3.7) [0.4 to 7.4]	44 (39, 48) [26 to 65]	6 (4, 8) [1 to 17]

Abbreviations: WMH, White matter hyperintensity; WM, White matter; WMHp, percentage of white matter at risk.

Percentages were calculated in the four main lobes and with regard to radial location.

Note: Values show are median (interquartile range) [range]