Table 4. Bispectral Index Values Obtained from the BIS® Electronic Files

Several electronic files were not recovered or were not recorded. The number of electronic files and the total number of patients randomized to the five sufentanil groups are presented. Values are expressed as mean (SD) or median [25th–75th percentile] when the distribution of values was not normal or when interpatient variability was considered to be (clinically) high.

* See the Materials and Methods section for the definition of episodes with Bispectal Index (BIS) values greater than 60.

NS = not significant; SQI = signal quality index.