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Correlations between the four features and EACL. a_d Correlations of HF, LF, ratio of HF/LF, and RR interval SampEn with the EACL, respectively. I, II, and III represent anaesthesia induction, anaesthesia maintenance, and anaesthesia recovery, respectively. EACL: expert assessment of consciousness level; HF: high-frequency; LF: low-frequency; HF/LF: high-to-low-frequency ratio
