Figure 3. Probability of response to command (recovery of consciousness) for combinations of BIS and time spent at any particular BIS value (threshold) or higher; 5%, 50%, and 95% probability of response curves are displayed for all subjects. For example, in the propofol group, when the bispectral index reaches 65, 50% of all patients responded to command within 240 s of achieving a BIS of 65, and 95% responded within 580 s.