Table 1.

Radiological codes used for interpretation of follow-up chest CT and number of patients in each category

COVID-19: CO-ronaVI-rus d-isease 2019, CT: computed tomography, FU: follow-up.

GROUP	CODE	DESCRIPTION	N (%) Tot.220
0	[0–0]	Without COVID-19 pneumonia (chest CT signs of pneumonia absent at baseline and absent at FU)	11 (5%)
1	[1–0]	COVID-19 pneumonia resolution (chest CT signs of pneumonia present at baseline and absent at FU)	91 (41,4%)
2	[1–01]	Resolution and new findings (CT chest CT signs of COVID-19 pneumonia present at baseline and resolved but present elsewhere at FU	11 (5%)
3	[1–11]	Stable (chest CT signs of COVID-19 pneumonia present at baseline and present unchanged at FU)	4 (1,8%)
4	[1–10]	Resolving pneumonia (CT chest signs of COVID-19 pneumonia present at baseline and reduced at FU)	85 (38,6%)
5	[1–12]	Worsened (CT chest CT signs of COVID-19 pneumonia present at baseline and increased at FU)	0
6	[0–1]	Onset (chest CT signs of COVID-19 pneumonia absent at baseline and present at FU)	0
7	[x-0]	Absence (chest CT not performed at baseline and no signs of COVID-19 pneumonia at FU)	10 (4,5%)
8	[x-11]	Missing / finding (chest CT not performed at baseline and signs of COVID-19 pneumonia present at FU)	5 (3,7%)