TABLE 1:

Comparisons of MR imaging volume data in different age groups

Variables20–49 y50–86 yP Values
MeanSDMeanSD
Intracranial (mL)1367.3147.41314.8152.6.22
GM (mL)717.896.8626.184.3.001
WM (mL)499.973.7445.356.0.003
% GM52.54.147.63.4<.0001
% WM36.64.034.03.9.02
GM/WM1.50.31.40.2.54