Table S2. P values of CT texture parameters among esophageal squamous carcinomas with lymph node metastasis for Shapiro-Wilk tests of normality assumption.

Parameters	Unenhanced CT			Contrast enhanced CT
	N−	N+		N−	N+
Mean	0.351	0.036		0.590	0.733
10th percentile	0.294	0.388		0.226	0.341
90th percentile	0.528	<0.001		0.472	0.896
Skew	0.649	0.415		0.027	0.950
Kurtosis	<0.001	0.003		0.001	<0.001
Entropy	0.178	0.538		0.272	0.085

The parameters verify normality assumption if the P value is larger than 0.05. N−, without lymph node metastasis; N+, with lymph node metastasis; CT, computed tomography.