2. Correlation analysis of risk factors for LN metastasis beyond the extent of D2 lymphadenectomy (N=102).

Characteristics	Univariate analysis					Multivariate analysis
	No.	LN metastasis beyond the extent of D2 lymphadenectomy (n)		P		OR	95% CI	P
		Positive (n=21)	Negative (n=81)
LN, lymph node; OR, odds ratio; 95% CI, 95% confidence interval; *, Fisher’s exact test; **, continuity correction.
Sex				0.896
Male	57	12	45
Female	45	9	36
Age (year)				0.048
≤65	75	19	56
>65	27	2	25
Tumor size (cm)				0.966
≤4.0	53	11	42
>4.0	49	10	39
Lauren type				1.000*
Intestinal	20	4	16
Diffuse	77	16	61
Mixed	5	1	4
pT stage				0.194*
T2	19	1	18
T3	7	2	5
T4a	72	17	55
T4b	4	1	3
pN stage				<0.001*		2.533	1.368−4.691	0.003
N0	37	0	37
N1	25	3	22
N2	16	5	11
N3a	17	7	10
N3b	7	6	1
Number of total LNs dissected				0.593**
<16	16	2	14
≥16	86	19	67
Proportion of LNs metastasis				<0.001*
0	37	0	37
<10%	17	4	13
10%−40%	36	11	25
>40%	12	6	6
Extent of LNs metastasis				<0.001		5.965	1.335−26.650	0.019
Peri-gastric	66	3	63
Extra-gastric	36	18	18