Table 3. Univariate Cox regression analysis.

Factors	B	SE	Wald	df	Sig.	Exp(B)
Gender	−0.325	0.633	0.264	1	0. 608	0.722
Age	0.024	0.022	1.154	1	0.283	1.024
Nerve invasion	−1.637	0.598	7.487	1	0.006	0.195
Clinical stage			5.088	2	0.078
I	−2.025	1.038	3.802	1	0.051	0.132
II	−0.868	0.640	1.839	1	0.175	0.420
Claudin-18 staining score	−0.600	0.211	8.075	1	0.004	1.549
Tumor size	0.390	0.099	15.616	1	0.000	1.477
Total count of lymph nodes	−0.010	0.025	0.170	1	0.680	0.990
Positive count of lymph nodes	0.078	0.033	5.639	1	0.018	1.081

B, coefficient value; SE, standard error; df, degree of freedom; Sig, significance; Exp(B), hazard ratios.