Figure 2. Maximum urinary osmolality after injection of vasopressin in each patient (open circles). Ten units of aqueous vasopressin was administered 16.5 h after cessation of anesthesia. Closed circles and error bars represent mean plus/minus SE. Mean maximal urinary osmolalities in the isoflurane, sevoflurane^high, and sevoflurane^lowgroups were 816 plus/minus 37 (650-1125), 681 plus/minus 60 (390-980), and 811 plus/minus 32 (630-1158) mOsm/kg, respectively. The dotted line represents the range of the twice standard deviation from the mean of the isoflurane group. No significant differences were found among the three groups (P = 0.068).