Table 4.

Comparison of 24 h serum indexes before and after operation

Indexes	Experimental group	Control group	t	P
NO (μmol/L)
Preoperative	4.39±1.03	4.62±0.98	1.845	0.066
24 h after operation	9.08±1.25###,***	11.36±1.68###	12.410	<0.001
β-EP (pg/mL)
Preoperative	103.21±16.10	100.25±15.17	1.526	0.128
24 h after operation	122.37±16.58###,**	145.39±20.55###	2.716	0.009
SP (pg/mL)
Preoperative	45.19±9.04	45.60±8.78	0.194	0.847
24 h after operation	60.14±9.11###,**	71.09±9.25###	4.938	0.001
IFN-γ (pg/mL)
Preoperative	1.78±0.22	1.80±0.24	0.351	0.726
24 h after operation	1.41±0.28##,**	1.62±0.30##	2.936	0.004
TNF-α (pg/mL)
Preoperative	103.25±20.33	105.14±19.24	0.406	0.685
24 h after operation	65.14±15.46###,***	46.39±15.04###	5.172	<0.001

Note: NO: Nitric oxide; β-EP: Endorphin; SP: Substance P; IFN-γ: Interferon-γ; TNF-α: Tumor necrosis factor-α.

Compared with the control group;

^***P<0.001;

^**P<0.01.

Compared with preoperatively;

^###P<0.001;

^##P<0.01.