Fig. 6. Effect (vertical axis) versus  desflurane effect compartment concentration (horizontal axis) relations in the patient with the lowest prediction probability (P^K) value for approximate entropy. The relationships for all four electroencephalogram (EEG) measures (approximate entropy, spectral edge frequency 95, bispectral index, and EEG median frequency) in this patient are shown. Each graph also shows the value for prediction probability P^K.