Table 3 Univariate analysis of DFS

^{ASA II}

^1.47

^1.02–2.12

^0.041

^{ASA III}

^2.72

^1.53–4.86

^0.001

^{Adjuvant treatment Yes}

^0.95

^0.74–1.21

^0.660

^{Blood transfusion Yes}

^1.01

^0.58–1.75

^0.983

^{Duration of anesthesia}

^1.02

^0.95–1.10

^0.553

^{Degree of differentiation}

^0.75

^0.57–0.99

^0.044

^Group

^0.84

^0.65–1.09

^0.192

^{Postoperative hospital stay}

^1.01

^1.00–1.03

^0.106

^{Pathological classification}

^{Squamous carcinoma}

^1.73

^0.57–5.24

^0.330

^{Surgical type McKeown}

^1.20

^0.92–1.58

^0.186

^{Surgical type Sweet}

^0.74

^0.55–1.01

^0.056

^{Surgical type Thoracoabdominal incision}

^0.91

^0.57–1.45

^0.688

^{TNM II}

^1.23

^0.84–1.80

^0.283

^{TNM III}

^1.67

^1.17–2.39

^0.005

^{Tumor location middle esophagus}

^1.23

^0.95–1.59

^0.124

^{Tumor location upper esophagus}

^1.29

^0.86–1.94

^0.223

^{Total hospital stay}

^1.02

^1.00–1.03

^0.013

^{The length of the operation}

^1.02

^0.95–1.10

^0.558