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Comparison between anaesthesia states. The Y-axis is logarithmically transformed. (A)–(D) Distributions of (a) HF, (b) LF, (c) the ratio of HF/LF, and (d) the RR interval SampEn values. I, II, and III represent anaesthesia induction, anaesthesia maintenance, and anaesthesia recovery, respectively. Vertical coordinates represent the four feature values. HF: high-frequency; LF: low-frequency; HF/LF: high-to-low-frequency ratio; EACL: expert assessment of consciousness level
