Effect of lymphadenectomy extent on advanced gastric cancer located in the cardia and fundus

Table 2 Multiple stepwise regression analysis with the Cox proportional hazards model (n = 236)

Characteristics	β	Wald	P	RR	95% CI
Result 1
Tumor size		8.40	0.015
3-6 cm vs < 3 cm	0.303	3.77	0.052	1.354	0.997-1.840
> 6 cm vs < 3 cm	0.530	7.88	0.005	1.699	1.174-2.460
pT category		37.34	0.000
T3 vs T2	0.899	13.51	0.000	2.457	1.522-3.969
T4 vs T2	1.498	33.55	0.000	4.471	2.693-7.420
Number of total LNs	-0.042	18.56	0.000	0.959	0.941-0.977
Number of positive LNs	0.094	53.05	0.000	1.098	1.071-1.126
Result 21
Tumor size		8.83	0.012
3-6 cm vs < 3 cm	0.299	3.67	0.055	1.349	0.993-1.833
> 6 cm vs < 3 cm	0.547	8.41	0.004	1.727	1.194-2.499
pT category		37.97	0.000
T3 vs T2	0.899	13.50	0.000	2.456	1.521-3.967
T4 vs T2	1.507	33.96	0.000	4.511	2.718-7.488
Number of positive LNs	0.052	20.20	0.000	1.053	1.030-1.077
Number of negative LNs	-0.045	19.69	0.000	0.956	0.938-0.975

¹Obtained by using number of negative LNs as the variable instead of number of total LNs.