The average residual sum of squares per data point (RSS/n) and relative AICc (ΔAICc) scores for the direct activation model, the delayed activation model and the multistage delayed activation model fit to the data in 20 patients.

ΔAICc scores are calculated as the difference between the AICc score of a model and the AICc score of the best model in each patient, respectively. Thus ΔAICc = 0 indicates the best model. The total ΔAICc score is calculated as sum of ΔAICc scores in all 20 patients, where the lowest total ΔAICc indicates the best overall model.