Confusion matrices for radial basis function (RBF)-SVMs using the 28 lasso-selected features based on pooled data. A: classifiers were trained and tested on data from individual subjects (P1, P2, P3) or on the pooled data (All). B: the confusion matrix results from classification of pooled data were split up by individual subject. x- and y-axis labels indicate naive (Na), mild (Mi), moderate (Mo), and severe (Se) states.