Power analysis for infants aged 0 to 3.9 months. (A) Median spectral power during maintenance anesthesia (end-tidal sevoflurane range, 1.8 to 2.5%) and emergence (end-tidal sevoflurane range, 0 to 0.3%); n = 20. (B) Power in the time domain during maintenance anesthesia and emergence for all infants. Dots represent mean values; lines show standard errors of the mean.