Figure 4. Group level spectral analyses comparing dexmedetomidine-induced unconsciousness to propofol-induced unconsciousness (TM) and propofol-induced unconsciousness (PM).

A. Power spectra of dexmedetomidine-induced unconsciousness vs. propofol-induced unconsciousness (TM). Electroencephalogram power was larger during propofol-induced unconsciousness (TM) compared to dexmedetomidine-induced unconsciousness at 14.9–40Hz (P < .0005, TGTS). Electroencephalogram power was larger during dexmedetomidine-induced unconsciousness at 0.7–10 Hz (P < .0005, TGTS).

B. Power spectra of dexmedetomidine-induced unconsciousness vs. propofol-induced unconsciousness (PM). Electroencephalogram power was significantly larger than dexmedetomidine-induced unconsciousness at 0.1–40Hz (P < 0.0005, TGTS).

Median spectra presented with 95% jackknife confidence intervals. Horizontal solid black line(s) represent frequency ranges at which significant difference existed.

dB: decibel

Hz: hertz

PM: peak max

TGTS: two group test spectrum

TM: trough max