Fig. 2

The graph of residuals for all 128 patients. The residuals are representing the discrepancy between original scoring by Halls et al. (y_H) and our linear and nonlinear models denoted by y_AL and y_AN, respectively. The maximal discrepancy for linear model (a), y_AL − y_H, was found to be − 4.27 and for nonlinear model (b), y_AN − y_H, was found to be − 3.76. In both cases the mean error is close to zero, which confirms high matching of models