From: Bispectral Index Monitoring Allows Faster Emergence and Improved Recovery from Propofol, Alfentanil, and Nitrous Oxide Anesthesia Anesthes. 1997;87(4):808-815. Figure Legend: Figure 5. Comparison of the cumulative probability of patients remaining unconscious after the discontinuation of propofol anesthesia in the BIS (light hatched area) and standard practice (SP, solid dark area) groups. Cumulative probabilities were determined using Kaplan-Meier survival analysis. Log-rank differences between the two distributions (BIS vs. SP) were highly significant (P < 0.0001). Date of download: 1/1/2018 Copyright © 2018 American Society of Anesthesiologists. All rights reserved.