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. 2021 Jun 9;37:100954. doi: 10.1016/j.eclinm.2021.100954

Table 4.

Sensitivity of the SARS-CoV-2 Rapid Antigen Test according to RT-PCR Ct accumulative categories.

Ct values N True positive Sensitivity% (CI95%)
<20 9 9 100 (65·54–100)*
<25 32 30 93·75 (79·19–99·23)
<30 41 34 82·93 (67·94–92·85)
<35 48 35 72·92 (58·15–84·72)

* calculate Agresti-Coull confidence intervals.