Fig. 5. The rate of new patient arrivals into mock 5-operating room (OR) postanesthesia care units (PACUs) as a function of clock time (in 0.5-h increments). (  A ) Each grayscale curve shows the arrival rate in 0.5-h intervals into the PACU from 5-OR suites created from unique groups of five ORs from our OR process time database. For each curve, the arrival rate is constant from 10:00 am to 4:30 pm. (  B ) One of the arrival rate curves from  panel A is highlighted and compared with the 95% confidence interval of a constant arrival rate model with an arrival rate of 0.36 patients per hour.