Table S1. The P values of CT texture parameters among esophageal squamous carcinomas at different T stages for Shapiro-Wilk tests of normality assumption.

Parameters	Unenhanced CT			Contrast enhanced CT
	T1–2	T3–4		T1–2	T3–4
Mean	0.533	0.003		0.151	0250
10th percentile	0.609	0.405		0.180	0.320
90th percentile	0.524	<0.001		0.502	0.873
Skew	0.751	0.437		0.098	0.276
Kurtosis	0.001	0.007		0.008	0.001
Entropy	0.273	0.877		0.286	0.476

The parameters verify normality assumption if the P value is larger than 0.05. T1–2, T1 and T2 stages were categorized as T1–2 group; T3–4, T3 and T4 stages were categorized as T3–4 group. CT, computed tomography.