Fig. 2From: Clinical value of station 4R node dissection in esophageal squamous cell carcinomaMetastasis rates of lymph node stations in the upper mediastinal region: in the entire group (A); upper thoracic ESCC (B); middle thoracic ESCC (C); lower thoracic ESCC (D). The chi-square test was used to compare the metastasis rate of 4R with that of other lymph node stations. *** p < 0.001Back to article page