Table 2.

Area under the receiver operating characteristic (ROC) curve (AUC) for each clinicopathologic feature of patients with esophageal squamous cell carcinoma (ESCC)

Feature	AUC (95% confidence interval)	P valuea
T category	0.658 (0.553–0.828)	0.028
N category	0.674 (0.540–0.809)	0.021
M category	0.678 (0.555–0.800)	0.021
Clinical stage	0.678 (0.555–0.800)	0.021
Overall survival	0.683 (0.548–0.818)	0.017
Progression-free survival	0.690 (0.553–0.828)	0.019

^aBy χ² test