Tumor heterogeneity in gastrointestinal stromal tumors of the small bowel: volumetric CT texture analysis as a potential biomarker for risk stratification

Table 3 The correlations of histogram parameters with the risk levels of small bowel-GISTs

Parameters	Arterial phase		Venous phase
Parameters	r	p value	r	p value
Mean attenuation (HU)	0.455	< 0.001^*	0.461	< 0.001^*
10th percentile attenuation (HU)	0.497	< 0.001^*	0.476	< 0.001^*
25th percentile attenuation (HU)	0.473	< 0.001^*	0.468	< 0.001^*
50th percentile attenuation (HU)	0.455	< 0.001^*	0.447	< 0.001^*
75th percentile attenuation (HU)	0.426	< 0.001^*	0.529	< 0.001^*
90th percentile attenuation (HU)	0.403	< 0.001^*	0.386	< 0.001^*
Skewness	− 0.099	0.354	− 0.090	0.399
Kurtosis	−0.192	0.070	−0.077	0.470
Entropy	0.594	< 0.001^*	0.593	< 0.001^*

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