Table S5. P values of CT texture parameters among esophageal squamous carcinomas at different N stages for Shapiro-Wilk tests of normality assumption.

Parameters	Unenhanced CT					Contrast enhanced CT
	N0	N1	N2	N3		N0	N1	N2	N3
Mean	0.351	0.924	0.016	0.365		0.590	0.959	0.981	0.337
10th percentile	0.294	0.734	0.019	0.351		0.226	0.535	0.862	0.411
90th percentile	0.528	0.855	0.002	0.176		0.472	0.245	0.686	0.290
Skew	0.649	0.805	0.373	0.427		0.027	0.977	0.995	0.949
Kurtosis	<0.001	0.136	0.050	0.490		0.001	0.001	0.065	0.034
Entropy	0.178	0.854	0.800	0.072		0.272	0.159	0.964	0.407

The parameters verify normality assumption if the P value is larger than 0.05. CT, computed tomography.