Table 2.

Number of CT scans assigned to the train, validation (val) and test sets used during the training and performance assessment of the U-net${}_1$ and the U-net${}_2$ networks

U-net${}_1$	Train	Val	Test
Plethora	319	40	40
MosMed (91 CT-0)	55	18	18
LCTSC	36	12	12
COVID-19-CT-Seg	–	–	10

U-net${}_2^{60\%}$	Train (60%)	Val (20%)	Test
COVID-19 Challenge	119	40	40
MosMed (50 CT-1)	30	10	10
COVID-19-CT-Seg	–	–	10

U-net${}_2^{90\%}$	Train (90%)	Val (10%)	Test
COVID-19 Challenge	179	20	–
MosMed (50 CT-1)	45	5	–
COVID-19-CT-Seg	–	–	10