Table 1

General data for patients in the observation and control groups

Variables	Dissection of common hepatic arterial lymph node (n=577）	No dissection of common hepatic arterial lymph node (n=239）	P value
Gender
Male	293	158	0.612
Female	185	81
Age	62.70±9.21	61.44±9.98	0.092
COPD	91/577	36/239	0.799
Smoking history	247/577	113/239	0.242
Alcohol history	232/577	107/239	0.229
Distance between tumour to incisor teeth	26.40±5.32	25.81±5.77	0.153
Tumour location			0.749
Cervix segment	59	21
Upper thoracic segment	106	51
Middle thoracic segment	279	110
Lower thoracic segment	133	57
TNM stage			0.633
IA	46	18
IB	58	27
IIA	93	36
IIB	133	57
IIIA	109	42
IIIB	110	49
IVA	28	10
Total lymph nodes	22.6±8.3	20.3±7.4	<0.001
Operation time (min)	243.52±37.44	239.08±32.69	0.131
Intraoperation bleeding	117.34±57.60	109.71±60.77	0.099
Postoperative abdominal complications (Clavien Dindo)			<0.001
I	33*	6*
II	5	2
III	2	2
IV	0	0
Postoperation chyloperitoneum	21	1	<0.001
Duration of ICU stay	1.03±0.20d	1.05±0.17d	0.987
Duration of abdominal drainage tube	3.52±1.70	1.90±0.71	<0.001
Postoperative duration	10.90±2.22	9.80±1.34	<0.001
Postoperative chemotherapy	429/577	187/239	0.239
Postoperative radiotherapy	411/577	163/239	0.389
Tumour-related death	232/577	97/239	0.921
3 years DFS	314/577	123/239	0.441
3 years OS	329/577	133/239	0.719

*Includes patients with postoperative chyloperitoneum.
COPD, Chronic Obstructive Pulmonary Disease; COPD, Chronic obstructive pulmonary disease; DFS, disease-free survival; ICU, Intensive Care Unit; OS, overall survival; TNM, tumor node metastasis classification.