Table 2 Multivariate analyses of risk factors for early recurrence in the development set (logistic regression model)

Tumor location

 Lower third

1

0

 Upper, middle third or mixed

1.87

1.34–2.60

< 0.001

41.5

Positive lymph node ratio

 < 0.335

1

0

 ≥ 0.335

3.37

2.37–4.78

< 0.001

81.0

pTNM stage

 II

1

0

 III

4.45

2.44–8.09

< 0.001

100.0

Lymphocyte count

 ≥ 1.5 × 10⁹/L

1

0

 < 1.5 × 10⁹/L

1.48

0.48–0.94

0.021

26.0

Postoperative infection complications

 No

1

0

 Yes

2.85

1.61–5.07

< 0.001

70.0

Adjuvant chemotherapy

 ≥ 6 cycles

1

0

 < 6 cycles

2.27

1.54–3.30

< 0.001

55.0