. 2016 Nov 2;11(11):e0166046. doi: 10.1371/journal.pone.0166046

Table 2. Follow-up and overall survival rates (OS).

Variables	Number (%)	5-year OS number (%)	Log-rank test
Variables	Number (%)	5-year OS number (%)	Χ²	P value^*
Age (years)
<40	6(46.2)	3(50.0)	0.122	0.727
≥40	7(53.8)	3(42.9)	0.122	0.727
Gender
Male	8(61.5)	4(50.0)	0.001	0.972
Female	5(38.5)	2(40.0)	0.001	0.972
TNM stage
T1/2	5(38.6)	4(80.0)	4.810	0.028 ^a
T3/4	8(61.5)	2(25.0)	4.810	0.028 ^a
N0	10(76.9)	6(60.0)	15.809	0.000 ^b
N1	3(23.1)	0(0)	15.809	0.000 ^b
M0	11(84.6)	6(54.6)	7.175	0.007 ^b
M1	2(15.4)	0(0)	7.175	0.007 ^b
Kadish stage
A/B	4(30.8)	4(100.0)	4.993	0.025 ^a
C/D	9(69.2)	2(22.2)	4.993	0.025 ^a
Hyams grade
Ⅰ/Ⅱ	6(46.2)	4(66.7)	2.168	0.141
Ⅲ/Ⅳ	7(53.8)	2(28.6)	2.168	0.141
Treatment
With EES	9(69.2)	6(66.7)	5.906	0.015 ^a
Without EES	4(30.8)	0(0)	5.906	0.015 ^a

* P values were calculated using Log-rank test.

a: P<0.05

b: P<0.01.