Figure 3. (A) Reduction by increasing concentrations of fentanyl of sevoflurane at which 50%, 5%, or 95% of patients were awake (MACawake, MACawake5, or MACawake95, respectively). (B) Reduction by increasing concentrations of fentanyl of sevoflurane at which 50% or 95% of patients did not move at skin incision (MAC or MAC95, respectively).