Age-matched group differences in brain volume measures.

The top measure for each region is the mean volume (mLs) and the bottom measure is the ratio of regional volume/cerebrum (defined as GM+WM+CSF). Standard deviation is in parentheses. Each variable has 1 df, with 55 df for each model.每个脑区的顶部指标为平均体积（mLs，毫升），底部指标为脑区体积与大脑体积的比值（大脑体积定义为灰质（Gray Matter, GM）、白质（White Matter, WM）与脑脊液（Cerebrospinal Fluid, CSF）之和）。标准差以括号形式标注。每个变量的自由度（degrees of freedom, df）为1，各模型的自由度均为55。