Table 2. Performance characteristics in the present study population based on the widely used diagnostic decision points.
| Allergen | sIgE (kU/L) | Allergy (+) | Allergy (-) | sensitivity | specificity | PPV | NPV |
|---|---|---|---|---|---|---|---|
| Egg white (< 24 months old) |
≥2 | 23 | 23 | 88.50% | 68.50% | 50.00% | 94.30% |
| <2 | 3 | 50 | |||||
| Egg white (≥ 24 months old) |
≥7 | 19 | 13 | 73.10% | 91.20% | 59.30% | 95.10% |
| <7 | 7 | 135 | |||||
| Cow's milk (<24 months old) |
≥5 | 15 | 3 | 60.00% | 95.10% | 83.30% | 85.50% |
| <5 | 10 | 59 | |||||
| Cow's milk (≥ 24 months old) |
≥15 | 11 | 1 | 40.70% | 99.90% | 91.70% | 87.30% |
| <15 | 16 | 110 |
sIgE, specific immunoglobulin E; PPV, positive predictive values; NPV, negative predictive values.