Table 2. Mean (SD) Values of all AEP Indicators, AAI, and Ce^propfor each Modified Observer's Assessment of Alertness/Sedation Scale (MOAAS) Level

Mann-Whitney tests were carried out in order to test significant differences between subsequent MOAAS levels.

AAI = A-Line ARX Index; AEP = auditory evoked potentials; Ce^prop= estimated propofol effect-site concentrations; MTA = extracted by Moving Time Average; ARX = extracted by an Autoregressive model with Exogenous input;

*= significant difference with subsequently lower MOAAS level (P < 0.05).