4.

Multivariate analysis of prognostic factors

Category	Parameter estimate	SE	Adjusted OR	95% CI	P
SE, standard error; OR, odds ratio; 95% CI, 95% confidence interval of the risk ratio; TA, transabdominal; TT, transthoracic; *, according to the 3rd English edition of Japanese classification of gastric carcinoma.
Surgical approach
TA			1	-
TT	0.582	0.171	1.790	1.279; 2.504	0.001
N stage*
N0			1	-
N1	0.395	0.266	1.485	0.882; 2.499	0.136
N2	0.638	0.256	1.893	1.146; 3.126	0.013
N3	1.203	0.241	3.330	2.076; 5.342	< 0.001
Residual degree
R0			1	-
R1/R2	0.912	0.333	2.490	1.296; 4.785	0.006