Table 3 Accuracy measures of the BS strip assay categorized according to Ct values.

From: Modified streptavidin–biotin based lateral flow test strip for rapid detection of SARS-CoV-2 S1 antigen in saliva samples

  

Sensitivity (%)

Specificity (%)

PPV (%)

NPV (%)

Diagnostic efficacy (%)

Kappa

In saliva

Overall Ct

95.21

99.29

99.42

93.29

96.56

0.931

at Ct \(\le\) 30

98.54

99.29

98.55

98.58

98.57

0.968

at Ct \(\le\) 35

95.38

99.29

98.41

97.89

98.05

0.955

at Ct \(\le\) 40

88.89

99.29

97.56

96.53

96.76

0.909

In nasopharyngeal

Overall Ct

91.11

98.57

98.80

89.61

94.38

0.887

at Ct \(\le\) 30

94.29

98.57

97.06

97.18

97.14

0.935

at Ct \(\le\) 35

92.31

98.57

96.77

96.50

96.59

0.92

at Ct \(\le\) 40

84.44

98.57

95.00

95.17

95.14

0.863

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