Table 3. Univariate and multivariate analysis in the whole population.

Variable	Median survival (months)	Univariate analysis			Multivariate analysis
		HR	95% CI	P value	HR	95% CI	P value
Sex		0.613	0.428-0.878	0.008**	0.565	0.391-0.816	0.002**
Male	16
Female	24
Age		1.027	0.781-1.35	0.849
≥70	18
<70	19
Tumor location		1.109	0.942-1.305	0.215
Upper	21
Middle	14
Lower	17
T stage		1.908	1.552-2.345	<0.001***	1.298	1.056-1.596	0.013**
T1-2	22
T3	15
T4	7
N stage		2.483	2.041-3.021	<0.001***	2.311	1.877-2.846	<0.001***
N1	41
N2	20
N3	9
TNM stage		2.939	2.082-4.149	<0.001***	2.307	1.541-3.456	<0.001***
II	43
III	19
IV	8
Supraclavicular nodes		1.038	0.792-1.359	0.789
Positive	19
Negative	17
Left gastric nodes		0.762	0.572-1.015	0.063
Positive	14
Negative	21
Celiac nodes		0.416	0.304-0.567	<0.001***	0.599	0.416-0.862	0.006**
Positive	11
Negative	22
Common hepatic nodes		0.291	0.194-0.435	<0.001***	0.417	0.260-0.669	<0.001***
Positive	7
Negative	21
Treatment modality		1.588	1.184-2.13	0.002**	1.754	1.304-2.359	<0.001***
Chemoradiotherapy	21
Radiotherapy alone	11
Radiation dose		1.630	1.245-2.134	<0.001***	1.388	1.058-1.820	0.018*
≥60 Gy	22
<60 Gy	13

*, P < 0.05; **, P < 0.01; ***, P < 0.001.