Figure 2. Computer-assisted continuous infusion bias analysis. The percentage performance error for all propofol serum samples (Appendix 1 Table 3) is plotted against the mean of the predicted and measured propofol serum concentrations. Each patient is represented by two serum samples. Patients who moved ([triangle, open]) or did not move ([triangle, closed]) are represented in each group:(A), control ([circle, open], [circle, closed]);(B) low dose + esmolol ([triangle, open], [triangle, closed]); and (C) high dose + esmolol (down triangle, open], [down triangle, closed]).