Table 4.

The results of multivariate subdistribution hazard model for stage IB GAC patients

Characteristics	Before PSM			After PSM
	HR	95%CI	p value	HR	95%CI	p value
Age	1.02	1.01–1.03	<0.001	1.01	0.99–1.04	0.281
Year
2004–2007	Reference			Reference
2008–2011	0.74	0.60–0.92	0.006	0.56	0.31–1.04	0.066
2012–2015	0.71	0.55–0.89	0.004	0.86	0.47–1.56	0.611
Gender
Female	Reference			Reference
Male	1.32	1.06–1.65	0.013	1.92	1.04–3.54	0.037
Race
White	Reference			Reference
Non-White	0.99	0.81–1.22	0.941	1.04	0.59–1.84	0.881
Marital status
Married	Reference			Reference
Unmarried	1.14	0.93–1.40	0.222	1.16	0.65–2.07	0.621
Grade
I/II	Reference			Reference
III/IV	1.11	0.92–1.33	0.271	1.02	0.62–1.73	0.941
T stage
T1	Reference			Reference
T2a	0.81	0.39–1.66	0.552	2.18	0.53–8.94	0.282
Primary site
Cardia/fundus	Reference			Reference
Greater curvature/lesser curvature/body	0.48	0.38–0.62	<0.001	0.58	0.32–1.05	0.072
Others	0.52	0.37–0.73	<0.001	0.25	0.10–0.67	0.006
Pylorus/antrum	0.4	0.31–0.51	<0.001	0.27	0.12–0.6	0.001
Tumor size
≤2cm	Reference			Reference
≤5cm	1.06	0.86–1.32	0.611	1.51	0.86–2.64	0.152
>5cm	1.02	0.75–1.39	0.892	1.56	0.71–3.44	0.271
RNE
≥16	Reference			Reference
1–15	1.33	1.09–1.62	0.004	1.63	1.02–2.63	0.043
RNP
0	Reference			Reference
1	1.17	0.56–2.47	0.683	2.78	0.65–11.93	0.171
2	1.57	0.72–3.39	0.251	1.94	0.35–10.67	0.442
Radiation
None	Reference			Reference
Yes	1.29	0.95–1.77	0.113	1.54	0.82–2.97	0.201
Chemotherapy
None	Reference			Reference
Yes	0.71	0.53–0.96	0.028	0.51	0.31-0.82	0.007