Table 2 The univariate and multivariate analyses of factors associated with LN metastasis for all patients

Age, n (%)

0.300

-

 < 60

127(41.2%)

118(45.6%)

 ≥ 60

181(58.8%)

141(54.4%)

Smoking, n (%)

 No

99(32.1%)

71(27.4%)

0.221

 Yes

209(67.9%)

188(72.6%)

Tobacco (Brinkman index)

400

400

0.243

Drinking Alcohol, n (%)

0.273

-

 No

122(39.6%)

91(35.1%)

 Yes

186(60.4%)

168(64.9%)

Total alcohol consumption, drinks

250

250

0.119

-

Location of primary cancer, n (%)

0.038

0.088

 Upper

37(12.0%)

26(10.0%)

 Middle

210(68.2%)

158(61.0%)

 Lower

61(19.8%)

75(29.0%)

Operation, n (%)

0.743

-

Ivor-Lewis

33(10.7%)

30(11.6%)

Mckeown

275(89.3%)

229(88.4%)

Length of primary cancer, n (%)

0.088

0.547

 < 3.75 cm

193(62.7%)

144(55.6%)

 ≥ 3.75 cm

115(37.3%)

115(44.4%)

pT stage of primary cancer, n (%)

 < 0.001

 < 0.001

 T1

80(26.0%)

22(8.5%)

 T2

71(23.1%)

49(18.9%)

 T3

85(27.6%)

90(34.7%)

 T4

72(23.4%)

98(37.8%)

Dissection number of lymph nodes, n (%)

 < 0.001

0.002

 < 24

191(62.0%)

120(46.3%)

 ≥ 24

117(38.0%)

139(53.7%)

Cohort, n (%)

0.015

0.010

 SESCC

289(93.8%)

228(88.0%)

 S-MPESCC

19(6.2%)

31(12.0%)