Table 2 -

a. The nine of most relevant variables (among the initial 12), in standardized form obtained through exhaustive feature selection and five-fold cross-validation on the training set. b. Mean and standard deviation of the most relevant variables, in unstandardized form.

a. 从初始12个特征变量中筛选出的9个最相关特征变量，均采用通过训练集上穷举特征选择与五折交叉验证得到的标准化形式。
b. 上述最相关特征变量的均值与标准差采用非标准化形式。