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Table 4 Cox regression models for predicting overall survival

From: Prognostic and predictive significance of tumor length in patients with esophageal squamous cell carcinoma undergoing radical resection

  Base model Categorical tumor length Continuous tumor length
Variable HR 95 % CI P value HR 95 % CI P value HR 95 % CI P value
G1 (reference) 1    1    1   
G2 1.551 1.193–2.018 0.001 1.548 1.190–2.013 0.001 1.563 1.202–2.034 <0.001
G3 1.191 0.950–1.495 0.130 1.182 0.942–1.484 0.148 1.178 0.939–1.478 0.157
Upper tumor (reference) 1    1    1   
Middle tumor 1.192 0.684–2.075 0.535 1.174 0.674–2.044 0.571 1.188 0.682–2.068 0.543
Lower tumor 1.180 0.677–2.056 0.560 1.148 0.658–2.001 0.627 1.156 0.664–2.015 0.608
T1 (reference) 1    1    1   
T2 1.757 1.220–2.531 0.002 1.685 1.167–2.433 0.043 1.636 1.033–2.362 0.008
T3 2.296 1.651–3.193 <0.001 2.133 1.522–2.990 <0.001 2.067 1.478–2.892 <0.001
T4 3.066 2.070–4.544 <0.001 2.869 1.924–4.270 <0.001 2.772 1.864–4.123 <0.001
N0 (reference) 1    1    1   
N1 1.717 1.418–2.079 <0.001 1.725 1.425–2.089 <0.001 1.700 1.404–2.057 <0.001
N2 2.822 2.304–3.457 <0.001 2.791 2.278–3.418 <0.001 2.777 2.268–3.402 <0.001
N3 4.705 3.670–6.032 <0.001 4.654 3.629–5.968 <0.001 4.618 3.601–5.923 <0.001
Tumor length     1.170 1.005–1.363 0.043 1.058 1.020–1.097 0.002
Bootstrap-corrected C-index (%) 69.4    69.6    69.8