Before revision:  The best nonlinear regression to averaged data and 60\% of individual data is Hull's model, while for the remaining 40\% of the subjects the dynamical model (i) provides a better fit .
After revision:  There is weak to positive evidence that Hull model is the best nonlinear regression to averaged data and 60\% of individual data is Hull's model, while for the remaining 40\% of the subjects the dynamical model (i) provides a better fit .