Figure 6. The ratio of concentrations after administration of propofol emulsion without EDTA to administration of propofol emulsion with EDTA at each point in time for each volunteer is shown (top). The mean ratio at each point in time (solid line) and the 95% confidence bounds (dashed lines) also are illustrated (bottom). The confidence bounds include 1 at each point in time, confirming the visual impression from the top part that the pharmacokinetics of propofol are not influenced by EDTA.