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Validity of the rapid antigen detection test depending on the number of Centor criteria
| Number of Centor criteria | n | %GABHS | Sensitivity,% | Specificity,% | Positive predictive value,% | Negative predictive value,% |
|---|---|---|---|---|---|---|
| 1 | 73 | 0(-) | - | 95.9 | - | 95.9 |
| 2 | 87 | 13(14.9) | 84.6 | 89.2 | 57.9 | 97.1 |
| 3 | 74 | 19 (25.7) | 94.7 | 94.5 | 85.7 | 98.1 |
| 4 | 42 | 17 (40.5) | 88.2 | 100.0 | 100.0 | 92.6 |
| Total | 276 | 49 (17.8) | 89.8 | 93.8 | 75.9 | 97.7 |
GABHS = group A beta-haemolytic streptococcus.
