['Occasionally emergence from anesthesia is delayed. We examined the factors which exert influence on the emergence time.', 'The emergence time was assessed in 1133 surgical patients who received balanced anesthesia. Balanced anesthesia was maintained with infusion of propofol, ketamine, vecuronium, and buprenorphine, with nitrous oxide. OT time was defined as the time from the end of operation to extubation, TA time from extubation to leaving the operation room, and these times were examined retrospectively.', 'The emergence time of OT was 3.9 +/- 2.6 min, and that of TA was 3.7 +/- 2.2 min, for all subjects who were extubated in the operating room. Factors affecting the emergence delay were ASA classification, JCS classification, ages, department of surgery, the time of anesthesia, and the anesthesiologists.'] Does [ Main cause of the emergence delay from balanced anesthesia ]?