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. 2021 Oct 18;21:1071. doi: 10.1186/s12879-021-06716-1

Table 1.

Performance of Sofia stratified by days of symptoms

Sofia performance No. days from symptom onset prior to test All patients
 < 5 days  ≥ 5 days
(A) Symptomatic Patients. Symptomatic patients were stratified as < 5 days or ≥ 5 days of symptoms prior to receiving testing
 % Agreement 101/104 (97.1%) 42/44 (95.5%) 143/148 (96.6%)
 Sensitivity 27/30 (90%) 9/11 (81.8%) 36/41 (87.8%)
 Specificity 74/74 (100%) 33/33 (100%) 107/107 (100%)
 PPV 100% 100% 100%
 NPV 96.1% 94.3% 95.5%
Sofia performance All asymptomatic patients
(B) Asymptomatic Patients. PPV and NPV values were calculated with the respective prevalence for each group
 % Agreement 140/144 (97.2%)
 Sensitivity 2/6 (33.3%)
 Specificity 138/138 (100%)
 PPV 100.0%
 NPV 97.2%