Fig. 6. Total number of patients in the postanesthesia care unit (PACU) and waitlist at 1 pm. Data ( bars ) versus model ( curve with error bars ). The horizontal axis shows the total number of patients in the PACU queue at 1:00 pm (sum of patients in the PACU plus those waiting in the operating room (OR) for a PACU bed). The physical capacity of the PACU is 28 patients, but the unit operates at its functional capacity of 24 patients. The vertical axis is the number of occurrences of a given occupancy in 2006. The error bars indicate the 95% confidence interval for getting a given observation if the model is true. The figures show performance from regular workdays only (251 in 2006).