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Table 1 Performance of Sofia stratified by days of symptoms

From: Performance of SARS-CoV-2 antigen testing in symptomatic and asymptomatic adults: a single-center evaluation

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%