Table 1. Comparison of the patient characteristics and clinical features between observation group and control group.

Items	Observation group (n=55)	Control group (n=55)	P value
Age (years old)	67.73±6.69	67.00±5.58	0.537
Gender			0.525
Male	38	41
Female	17	14
Complications			0.409
Positive	19	15
Negative	36	40
Tumor location			0.561
Upper	9	7
Middle	32	29
Lower	14	19
PNI value			0.569
≤45	28	25
>45	27	30
Pathological staging			0.130
I–II	44	37
III	11	18

PNI, prognostic nutritional index.