Table S3. P values of CT texture parameters among esophageal squamous carcinomas at different overall stages for Shapiro-Wilk tests of normality assumption.

Parameters	Unenhanced CT			Contrast enhanced CT
	I–II	III–IV		I–II	III–IV
Mean	0.535	0.138		0.575	0.805
10th percentile	0.643	0.561		0.478	0.661
90th percentile	0.489	0.003		0.657	0.914
Skew	0.926	0.323		0.001	<0.001
Kurtosis	0.001	0.001		0.001	<0.001
Entropy	0.181	0.807		0.305	0.195

The parameters verify normality assumption if the P value is larger than 0.05. I–II: I and II stages were categorized as I–II group; III–IV: III and IV stages were categorized as III–IV group; CT, computed tomography.