Fig. 5. Probability of loss of response to verbal commend (LORverbal), eyelash reflex (LORlash), and a tetanic electrical stimulus (LORnoxious) as a function of the propofol effect-site concentration (Ce). Data from the 0 ng/ml remifentanil (Remi) group are presented as a solid line , data from the 2 ng/ml remifentanil group as a dotted line , and data from the 4 ng/ml remifentanil group as a dashed line .