Comparison of changing ratios of the spectral power in the different sedation levels.

p-value in each subplot indicates significant differences between each ratio of the EEG spectral power (i. e., theta, alpha, beta, and sigma) in the different sedation levels (i. e., deep sedation/pre-sedation, conscious sedation/pre-sedation, and deep sedation/conscious sedation). The diagonal line is y = x in each plot.