Fig. 2. Correlation between total costs and anesthesia time per anesthesia subspecialty. Total costs includes anesthesiologists and anesthesia nurse personnel costs, recovery room costs, material and pharmaceuticals, and overhead costs as described in the Materials and Methods. Displayed are the average total costs in Euros per minute per subspecialty with the 95% confidence interval for each subspecialty. Anesthesia time is the average anesthesia time per subspecialty in minutes. Also displayed is the best-fit regression line ( thick line ; adjusted R 2= 0.69) with its 95% confidence intervals ( thin lines ). ENT = ear, nose, and throat surgery; OB/GYN = obstetrics and gynecology. Further details are provided in the Materials and Methods.