Table 5.

Subgroup analyses for overall survival before and after propensity score analysis.

Factors	Group	Before propensity score		Propensity score analysis
		HR and 95% CI	P-value	HR and 95%CI	P-value
Age (years)	<65.0	2.949 (1.283–6.774)	0.011	2.840 (1.161–6.945)	0.022
	>65.0	1.581 (0.890–2.808)	0.118	1.363 (0.725–2.562)	0.337
Race	White	1.700 (0.907–3.186)	0.098	1.530 (0.781–2.997)	0.215
	Asian	8.072 (0.823–79.156)	0.073	6.308 (0.571–69.650)	0.133
Anatomic tumor site	Antrum/distal	3.278 (1.553–6.922)	0.002	3.018 (1.353–6.732)	0.007
	Fundus/body	1.904 (0.805–4.504)	0.143	1.392 (0.563–3.438)	0.474
	Position-others	1.082 (0.423–2.770)	0.869	1.133 (0.408–3.150)	0.810
Grade	1–2	1.933 (0.904–4.131)	0.089	1.320 (0.592–2.942)	0.497
	3	2.376 (1.275–4.428)	0.006	2.576 (1.267–5.238)	0.009
TNM-T	T1–2	3.838 (1.130–13.038)	0.031	3.590 (0.937–13.760)	0.062
	T3–4	1.856 (1.103–3.124)	0.020	1.639 (0.926–2.901)	0.090
TNM-N	N0–1	1.873 (0.923–3.802)	0.082	1.746 (0.840–3.627)	0.135
	N2–3	2.127 (1.114–4.064)	0.022	1.695 (0.812–3.539)	0.160
TNM-M	M0	2.132 (1.274–3.567)	0.004	1.843 (1.055–3.217)	0.032
	M1	1.103 (0.333–3.651)	0.872	1.149 (0.305–4.329)	0.837
Stage	I and II	2.305 (0.855–6.215)	0.099	2.291 (0.782–6.712)	0.131
	III and IV	2.095 (1.191–3.685)	0.010	1.652 (0.893–3.055)	0.110

CI – confidence interval; HR – hazard ratio; M – metastasis; N – node; T – tumor.