Table 5. Comparison of CV and QCD among first-order, texture, and wavelet features.

P value†	Standard-dose group			Low-dose group
	CV	QCD		CV	QCD
First-order vs. texture vs. wavelet	<0.001	<0.001		0.04	<0.001
First-order vs. texture	0.01	0.02		0.86	0.61
First-order vs. wavelet	<0.001	<0.001		0.03	<0.001
Texture vs. wavelet	0.01	<0.001		0.41	0.01

^†, Kruskal-Wallis test was used to compare CV and QCD among five reconstruction settings and Bonferroni method was used for pairwise comparisons. CV, coefficient of variation; QCD, quartile coefficient of dispersion.