Figure 3. Changes over time in urinary NAG excretion in the three groups. Urinary excretion of NAG in both the sevofluranehighand the sevofluranelowgroups was significantly higher after than before anesthesia. Data points represent mean plus/minus SE. *P < 0.05; **P < 0.01 compared with each preoperative value. (dagger)P < 0.05 compared with the isoflurane group. (paragraph)P < 0.05 compared with the sevoflurane sub low group.