Table 3 Univariable cox proportional hazards analysis of factors predictive of survival

Age

1.130(0.897–1.424)

0.301

0.923(0.615–1.384)

0.698

  ≤ 60

  > 60

Sex

0.851(0.644–1.125)

0.256

0.763(0.467–1.247)

0.281

 Female

 Male

Tumor Location

0.988(0.816–1.196)

0.902

1.149(0.830–1.593)

0.403

 Upper

 Middle

 Lower

Tumor Grade

1.267(1.071–1.498)

0.006

1.351(1.022–1.788)

0.035

 High

 Median

 Low

T Stage

1.773(1.542–2.039)

 < 0.001

1.464(1.178–1.819)

0.001

 T1

 T2

 T3

 T4a

N Stage

1.649(1.475–1.844)

 < 0.001

1.599(1.319–1.939)

 < 0.001

 N0

 N1

 N2

 N3

TNM Classification

1.981(1.681–2.333)

 < 0.001

1.649(1.280–2.124)

 < 0.001

 I

 II

 III/IV

Anastomotic Leak

1.797(1.300–2.485)

 < 0.001

1.925(1.142–3.245)

0.014

 No

 Yes

Pulmonary Infection

1.407(1.088–1.819)

0.009

1.11(0.714–1.727)

0.624

 No

 Yes

Chylothorax

0.975(0.460–2.065)

0.947

0.648(0.159–2.629)

0.543

 No

 Yes

Adjuvant Therapy

1.137(0.941–1.375)

0.183

1.262(0.916–1.738)

0.154

 No

 Chemotherapy

 Radiochemotherapy