Fig. 5. Exploratory analysis of the effect of remifentanil on propofol pharmacokinetics and vice versa , part 1. (Top ) Prediction errors of propofol versus the corresponding predicted remifentanil concentration, both based on Bayesian pharmacokinetic parameters obtained from the population analysis assuming no interaction. (Bottom ) Prediction errors of remifentanil versus the corresponding predicted propofol concentration, both based on Bayesian pharmacokinetic parameters obtained from the population analysis assuming no interaction.