Comparison of clinical efficacy and postoperative inflammatory response between laparoscopic and open radical resection of colorectal cancer

Table 3 Comparison of pain stress response indexes before and after operation between the two groups (mean ± SD)

Time	Groups	Cases	NPY (g/L)	PGE2 (ng/L)	5-HT (ng/L)
Before the operation	Study group	48	109.79 ± 13.46	269.54 ± 37.34	151.70 ± 18.86
	Control group	48	113.29 ± 15.01	273.91 ± 40.04	148.85 ± 20.45
	t		1.203	0.553	0.710
	P		0.232	0.582	0.480
After the operation	Study group	48	153.13 ± 16.91	313.76 ± 40.64	218.78 ± 22.65
	Controlgroup	48	178.68 ± 20.51	369.78 ± 44.37	267.64 ± 30.74
	t		6.659	6.450	8.865
	P		0.000	0.000	0.000

NPY: Neuropeptide; PGE2: Prostaglandin E2; 5-HT: 5-hydroxytryptamine.