Fig. 5From: Time-trend analysis of the center frequency of the intrinsic mode function from the Hilbert–Huang transform of electroencephalography during general anesthesia: a retrospective observational studyBIS, SEF95, and EMGlow during induction, maintenance, and emergence phases. The dots and error bars indicate the median and interquartile ranges of BIS (red), SEF95 (blue), and EMGlow (green). ***: p < 0.001Back to article page