Features | Subgroup | RT-qPCR test | RT-qPCR test | Sensitivity % (CI) | Specificity % (CI) | Accuracy % | Likelihood ratio | |
Standard ™ Q COVID-19 Ag test
|
Positive (n = 69) | Negative (n = 14) | ||||||
All
|
Ct values
|
Positive (n = 59) |
54
|
5
|
78.2 (0.67-0.86) | 64.2 (0.38-0.83) |
75.9
|
2.1
|
Negative (n = 24) |
15
|
9
|
||||||
Subgroups of RT-qPCR positive patients* | Strongly positive (< 29) |
Positive
|
28
|
28
|
96.5 (0.83-0.99) | 44 (0.31-0.57) |
63.2
|
1.7
|
Negative | 1 | 22 | ||||||
Moderately positive (29-36) |
Positive
|
21
|
38
|
72.4 (0.54-0.85) | 29.6 (0.19-0.42) |
44.5
|
1
|
|
Negative | 8 | 16 | ||||||
Weakly positive (37-39) |
Positive
|
5
|
54
|
45.4 (0.21-0.71) | 23.9 (0.15-0.35) |
26.8
|
0.59
|
|
Negative | 6 | 17 |