Average power evolution. Summation of low-band power (left, 0.05–0.149 Hz), high-band power (middle, 0.15–0.3 Hz), and broadband power (right, 0.05–0.3 Hz) are shown for both the short (dotted) and long (solid) isoflurane groups. Mean and SEM values for each group are plotted for each time point. Significant differences are found between the short and long isoflurane groups in the low-band power at the 1.25, 1.75, and 2.25h data points, in the high-band power at the 1.25, 1.75, and 2.25 h data points, and in the broadband power at the 1.25, 1.75, 2.25, and 2.75h data points. Intra-group evaluations highlighting differences between early data and late data are calculated and presented in Table 2.