Table 2.

Summary of results (median) for Chest CT texture parameters within the two patient diagnostic groups

CT texture parameters	COVID-19 positive (median)	COVID-19 negative (median)	p value
Without filtration—SSF = 0
Mean intensity (HU)	− 288.710	− 247.353	0.041
Standard deviation	111.783	125.147	0.052
Entropy	4.733	4.758	0.954
Mean of positive pixels	25.313	35.302	0.004
Skewness	− 0.059	− 0.055	0.324
Kurtosis	0.227	0.590	0.002
Fine texture scale—SSF = 2
Mean intensity	44.009	86.771	0.114
Standard deviation	287.950	322.172	0.004
Entropy	4.869	4.928	0.618
Mean of positive pixels	271.700	309.479	0.004
Skewness	0.027	0.075	0.713
Kurtosis	0.202	0.131	0.797
Medium texture scale—SSF = 3
Mean intensity	81.300	119.381	0.155
Standard deviation	275.755	312.614	0.012
Entropy	4.857	4.918	0.609
Mean of positive pixels	272.036	324.228	0.023
Skewness	− 0.045	− 0.050	0.834
Kurtosis	− 0.150	− 0.071	0.648
Coarse texture scale—SSF = 4
Mean intensity	69.778	123.457	0.174
Standard deviation	255.785	284.804	0.091
Entropy	4.834	4.934	0.513
Mean of positive pixels	258.064	306.420	0.108
Skewness	− 0.138	− 0.148	0.867
Kurtosis	− 0.289	− 0.285	0.871

Statistically significant results based on Mann–Whitney test are highlighted in bold