Fig. 3.
Prediction probability (PK) analysis between the SI values and averaged approximate entropy indices, derived from the electrocorticographic data under sevoflurane (A), desflurane (B), isoflurane (C), and enflurane (D) anesthesia, respectively. The values are given in the form of mean ± SD. The approximate entropy is computed with the embedding dimension m = 2 and noise threshold r = 0.2, and averaged across multiple channels.