Fig. 3

Diagnostic characteristics of low-dose chest CT and impact on participant admission to isolation ward. a Doughnut chart represents proportions and b contingency tables frequencies of true positive, false negative, true negative, and false negative diagnosed participants. Chest CT diagnostic performance is given for both the reference standard of RT-PCR test only and the reference standard of RT-PCR and/or AB test. Test characteristics are presented with 95% confidence intervals. AB, antibody test; COVID-19, coronavirus disease 2019; CT, low-dose chest computed tomography; LR + , positive likelihood ratio; LR-, negative likelihood ratio; RT-PCR, reverse transcription polymerase chain reaction