Table 2 Analysis of prognostic factors

Age

4.224

0.040

5.091

0.024

2.675

0.102

<70ys

≥ 70ys

R0 resection

3.949

0.047

1.844

0.175

0.193

0.660

Yes

No

Pathological differentiation

0.036

0.850

0.083

0.774

0.015

0.902

well differentiation

poor differentiation

Tumor location

1.213

0.271

2.187

0.139

5.248

0.022

Proximal

middle and distal

Stage TNM

6.515

0.011

6.151

0.013

0.003

0.955

I + II

III + IV

Population characteristics

2.882

0.090

2.448

0.118

0.003

0.955

low-risk

high-risk

Radiotherapy techniques

1.041

0.308

0.290

0.590

0.148

0.700

3-DCRT

IMRT

Duration of radiotherapy

2.454

0.117

0.642

0.423

0.164

0.686

<35days

≥ 35days