Quantification of pulmonary opacities using artificial intelligence in chest CT scans during SARS-CoV-2 pandemic: validation and prognostic assessment

Egyptian Journal of Radiology and Nuclear Medicine

Table 3 AUC for low and high opacities percentages

Test result variable(s)	Area	Std. error^a	Asymptotic Sig.^b	Asymptotic 95% confidence interval
Test result variable(s)	Area	Std. error^a	Asymptotic Sig.^b	Lower bound	Upper Bound
LOP in any lung	0.807	0.027	< 0.001	0.755	0.860
LOP in the right lung	0.811	0.026	< 0.001	0.760	0.861
LOP in the left lung	0.808	0.026	< 0.001	0.758	0.859
HOP in any lung	0.861	0.020	< 0.001	0.821	0.901
HOP in the right lung	0.873	0.020	< 0.001	0.833	0.914
HOP in the left lung	0.901	0.018	< 0.001	0.867	0.935

Significance values lower than 0.05 are shown in bold
The area under the curve for LOP and HOP in the left lung, the right lung, and any lung is always higher than 0.8, with a 95% confidence interval. LOP: low opacity; HOP: high opacity.
^aUnder the nonparametric assumption
^bNull hypothesis: true area = 0.5