Fig. 1. Individual changes in bladder temperature from the operating room (OR) at the end of surgery until arrival in the postanesthesia care unit (PACU). Box plots of the final measurement in the OR and temperature upon arrival in the PACU. The middle , upper edge , and the lower edge of the box indicate the 50th, 75th, and 25thpercentile of the data set. The ends of the vertical lines indicate 1.5 times the interquartile range. The difference averaged 0.2 ± 0.3°C (95% confidence interval 0.13 to 0.29°C), P < 0.001. The average time elapsed between removal of the esophageal stethoscope and arrival in the PACU was 30 ± 12 min.