Table 2.

Comparison of oxidative stress indexes ($\overline{x}$ ± s).

Group	TNF-α (mg/L)		IL-6 (mg/L)		MDA (mmol/L)		SOD (U/L)
	Before the operation	7 days after surgery	Before the operation	7 days after surgery	Before the operation	7 days after surgery	Before the operation	7 days after surgery
Combined anesthesia group (n = 142)	1.87 ± 0.22	2.75 ± 0.27∗	2.28 ± 0.19	4.67 ± 0.42∗	3.75 ± 0.36	6.07 ± 0.44∗	100.93 ± 10.74	81.43 ± 8.65∗
The control group (n = 143)	1.84 ± 0.19	3.64 ± 0.33∗	2.31 ± 0.20	6.02 ± 0.53∗	3.71 ± 0.32	7.83 ± 0.58∗	102.12 ± 11.18	66.17 ± 7.52∗
T	1.232	−24.908	−1.298	−23.831	0.992	−28.845	−0.916	15.897
P	0.219	<0.001	0.195	<0.001	0.322	<0.001	0.360	<0.001

Note. ^∗ Comparison with preoperative, P < 0.05.