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. 2020 Nov 30;7(6):534–540. doi: 10.14744/nci.2020.42027

TABLE 4.

Performance of orange-red zone results of UFT test according to the clinical situation, RT-PCR and CT findings. The last line shows the total performance for all color scales of the UFT concerning the RT-PCR and/or CT positive COVID-19 status. According to the table, the UFT test shows the highest sensitivity when compared to the clinical situation (in this case the CT results are also positive)

Sensitivity Specificity PPV NPV Accuracy LR(+)
Mild/Moderate Orange/Red zone 0.95 0.85 0.56 0.99 0.87 6.33
Severe/Critical Orange/Red zone 0.93 0.98 0.87 0.99 0.97 40.39
RT-PCR Orange/Red zone 0.87 0.80 0.85 0.83 0.84 4.47
CT Orange/Red zone 0.93 0.87 0.67 0.99 0.88 7.32
RT-PCR and/or CT UFT/Al 0.87 0.80 0.97 0.35 0.84 5.47

UFT: Urine foaming test; RT-PCR: Real-time polymerase chain reaction; CT: Computerized tomography; PPV: Positive predictive value; NPV: Negative predictive value; LR: Likelihood-ratio.